ZIP Code 99691 in Nikolai, AK

Data Last Updated: March 1, 2026
City:Nikolai, Alaska
City Alias:Mc Grath
Borough:Yukon Koyukuk Borough
Timezone:Alaska (GMT -09:00)
Local Time:9:23:36 AM
Population:108 [See All]
Area Code:907
Classification:PO Box
Coordinates:63.0767, -154.4330
Land Area:4624.961 sq mi
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https://www.zip-codes.com/zip-code/99691/zip-code-99691.asp

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In the United States, a county equivalent is a political or administrative subdivision of a state. It has a specific geographic area and some level of governmental authority. The term "county" is used in 47 states. Alaska, Louisiana, and Connecticut have functionally equivalent subdivisions called Boroughs, Parishes, and Planning Regions, respectively. They functionally act like counties by subdividing the state.

99691 - Nikolai, AK

ZIP Code 99691, Nikolai

Tribal
LocationYukon Koyukuk County, AK
Area6.0 sq mi
Population108
Households53
PO Boxes17 Low Adoption (32%)
Median Age34.5 years
Seasonal Housing27%
ZIP CreatedBefore Oct 2004
Key Facts
  • This is a PO Box only ZIP code where all 108 residents must use post office boxes for mail delivery.
  • The community maintains 17 PO Boxes serving 53 households, with an adoption rate of 0.32 boxes per household.
  • Nikolai covers 4,625 square miles of land, making it one of Alaska's most geographically expansive postal service areas.
  • Native Americans represent 79% of the population (85 of 108 residents), identifying this as a predominantly tribal community.
  • One rural carrier route serves Nikolai Road, the only street with structured delivery records in the ZIP code.
  • The median household income is $35,313 with a median home value of $105,000, reflecting Alaska's remote living economics.

Geographic Reality and Demographics

The Yukon-Koyukuk Census Area is Alaska's largest borough by land area but one of its most sparsely populated. Nikolai's 108 people spread across this landscape maintain an average household size just over 2 people. The median age of 34.5 years shows a younger population than most rural Alaska communities. Extended families are common in Alaska Native communities, though Nikolai's household structure trends smaller than some tribal areas.

Delivery Infrastructure

The single rural carrier route connects the handful of residents who live along Nikolai Road. Most addresses don't work with traditional street delivery. The terrain and climate make carrier routes impractical for much of the area. Winter temperatures and limited road infrastructure mean the post office remains the reliable connection point year-round.

Economic Context

Median household income sits at $35,313, with the median home value at $105,000. These figures reflect Alaska's unique cost structure where remote living means higher expenses but often lower property values. The postal facility in Nikolai doesn't just deliver mail. It's where residents pick up packages, send important documents, and maintain connections to family and services elsewhere in Alaska and beyond.

Street Name Patterns

Minimal Infrastructure Tribal Roads

The ZIP code contains only one street with formal delivery records: Nikolai Road. This minimal street infrastructure reflects the community's remote location and reliance on the central post office for all mail services.

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Population & Demographics


ZIP Code 99691 has 108 residents and 53 households (average 2.04 persons per household). The median age is 34.5 years, slightly younger than the state (35.6) and younger than the nation (38.8). The gender split is 50.0% male and 50.0% female, which is slightly lower than the state male share (52.0%). Largest groups are American Indian & Alaska Native (78.7%, much higher than the state average of 15.2% and well above the national average of 1.1%) and White (13.9%, much lower than the state average of 59.4% and well below the national average of 61.6%); Hispanic or Latino residents make up 2.8%, which is much lower than the national average (18.7%), and American Indian & Alaska Native share is much higher than both the state (15.2%) and national averages (1.1%).

Explore More:Population Over TimeBy Age & GenderBy RaceBy GenderNativity & Citizenship

Source: U.S. Census 2020 Demographics & Housing Characteristics (DHC) and U.S. Census 2011-2024 American Community Survey (ACS) 5-Year Estimates.
2020 Population:108Source: Census DHC
2024 ACS Population Estimate:49Source: Census ACS
2026 ZC Population Estimate:0Source: ZIP-Codes.com
Population Density:0.0 people per sq mile
Average Income:$0Source: Census ACS
Households:53Source: Census DHC
Average House Value:$106,300Source: Census ACS
Persons Per Household:2.04Source: Census DHC
Average Family Size:2.33Source: Census ACS

Population Over Time (with 2010 & 2020 Census Benchmarks)


Group201020112102201320142015201620172018201920202021202220232024
Census ACS Population Estimate--63476675113120123114143115108919349
Decennial Census95------------------108--------
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP05. DEMOGRAPHIC AND HOUSING ESTIMATES

Population by Age & Gender (Total, Male, Female)


Median Age: 34.5

Male Median Age: 37.5

Female Median Age: 30.5

Group< 55-910-1415-1920-2425-2930-3435-3940-4445-4950-5455-5960-6465-6970-7475-7980-8485+
Male353144373250732200
Female831258544420520001
Total1184391281176701252201
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Population by Race


White:1514.56%
Black:00%
Hispanic:*32.91%
Asian:00%
American Indian:8582.52%
Hawaiian:00%
Other:00%
Total:103100%
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)
* NOTE: Hispanic or Latino is an ethnicity, not a race. This means individuals who identify as Hispanic will also be included in one of the race categories (such as White or Black). As a result, the totals shown here may exceed 100% when Hispanic is displayed alongside racial groups.

Gender Breakdown


GenderCount%Median Age
Males:5450.00%37.5 years
Females:5450.00%30.5 years
Total:108100%34.5 years
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Nativity & Citizenship


Native, born in the United States:49100.00%
Native, born in PR, Island Areas, or abroad:00.00%
Foreign born, naturalized U.S. citizen:00.00%
Foreign born, not a U.S. citizen:00.00%
Total Population:49100%
Total Native Population:49100.00%
Total Foreign-born Population:00.00%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS
Note: Nativity and Citizenship derived from American Community Survey (ACS) 5-year estimates. Total Population listed here will not match official ZIP Code population totals, which are based on the Decennial Census.

Income & Employment


In 2024, the Median household income is $0, which is well under the national median ($80,734), is down $17,708 (100.0%) since 2011 and below its 2019 pre-pandemic level by $37,500. Family households earn a median of $0 versus $0 for nonfamily households (a difference of $0). By gender, male median income is $0 and female is $0, which is considerably lower than the national female median ($55,274), with a current gap of $0 that has stayed about the same from 2011 to 2024. The labor-force participation rate is 65.9%, which is modestly greater than the national rate (63.5%). The unemployment rate is 0.0%, which is considerably lower than the national rate (5.2%). The largest occupation group is Service (34.5%).

Explore More:Income Over TimeHousehold IncomeEmployment StatusBy Occupation

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02, DP03, DP04 and DP05.

Median Income Over Time (Household, Family, Nonfamily, Male, Female)


Income Type20112012201320142015201620172018201920202021202220232024
Median Household Income$17,708$15,000$29,167$31,250$36,875$37,083$35,417$34,167$37,500$32,083$0$0$35,313$0
Median Family Income$19,688$19,688$53,750$53,333$53,750$56,250$53,750$39,375$37,500$0$0$0$0$0
Median NonFamily Income$8,750$7,188$11,667$13,125$18,750$23,750$0$26,250$30,000$0$0$0$0$0
Median Male Income$0$0$0$60,417$0$31,250$26,875$30,250$26,667$0$0$0$0$0
Median Female Income$0$0$51,250$52,500$0$48,750$46,250$0$0$0$0$87,917$93,036$0
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Average Household Income


Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment Status


Employed:2965.91%
Unemployed:00.00%
Not In Labor Force:1534.09%
Total:44100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment by Occupation (Civilian Employed Population, 16 and Over)


Management, business, science, and arts:413.79%
Service:1034.48%
Sales and Office:13.45%
Natural resources, construction, and maintenance:1034.48%
Production, transportation, and material moving:413.79%
Total Civilian Employed Population:29100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS.

Housing & Affordability


In 2024, the median home value is $106,300, which is far less than the national median ($332,700), is up $48,000 (82.33%) since 2011 and above its 2019 pre-pandemic level by $54,800. The median gross rent is $0, which is well under the national median ($1,413), is down $313 (100.00%) since 2011 and above its 2019 pre-pandemic level by $0. Insufficient data for owner/renter mix. Insufficient data for vacancy rate.

Explore More:Compare Home ValueHome Value Over TimeRent & Over TimeHousing Occupancy

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Table DP03, SELECTED ECONOMIC CHARACTERISTICS.

Median Home Value (Comparison)


Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Home Value Over Time


Group20112102201320142015201620172018201920202021202220232024
Median Home Value$58,300$58,300$85,000$95,000$42,500$47,500$28,500$28,800$51,500$68,800$59,000$91,700$105,000$106,300
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Gross Rent Paid


Less than $500:114.29%
$500 to $999:114.29%
$1,000 to $1,499:00.00%
$1,500 to $1,999:00.00%
$2,000 to $2,499:00.00%
$2,500 to $2,999:00.00%
$3,000 or more:00.00%
No Rent:571.43%
Total:7100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Gross Rent Over Time


Group20112102201320142015201620172018201920202021202220232024
Median Rent$313$313$317$381$650$575$538$625$0$0$0$0$0$0
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Housing Occupancy


Owner Occupied (with mortgage):00.00%
Owner Occupied (free and clear, no mortgage):2578.13%
Renter Occupied:721.88%
Total Occupied Housing Units:32100%

Occupied Housing Units:3240.00%
Vacant Housing Units (not graphed):4860.00%
Total Housing Units:80100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Housing Type (Single-Family, Multi-Family, Other)


Single-Family Units:80100.00%
Multi-Family Units:00.00%
Other Units:00.00%
Total Housing Units:80100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Education, Health & Community


In 2024, 2.30% of adults (25+) have a bachelor's degree or higher, which is comparable to the national rate (35.70%). High school or higher is 81.40%, which is comparable to the national rate (89.60%). The uninsured rate is 30.60%, which is far higher than the national rate (8.40%). Private coverage is 10.20%, which is far lower than the national rate (67.10%). The share of people in poverty is 0.00%, which is comparable to the national rate (8.80%), down 69.00 percentage points since 2011 and below its 2019 pre-pandemic level by 19.70 percentage points. This points to a pronounced improvement in local conditions - rising incomes, firmer consumer demand, and a stronger tax base. Among residents ages 3+, the largest enrollment group is high school (71.43%). College enrollment is 28.57%, which is comparable to the national rate (26.70%), meaning the community mirrors broader higher-education participation.

Explore More:Educational AttainmentHealth InsurancePoverty Over TimeSchool Enrollment

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02 and DP03.

Educational Attainment of Adults (25 and Older)


Less than 9th grade:49.30%
9th to 12th grade, no diploma:49.30%
High school graduate (includes equivalency):1841.86%
Some college, no degree:1227.91%
Associate's degree:49.30%
Bachelor's degree:12.33%
Graduate or professional degree:00.00%
Total:43100%
High school or higher:3581.40%
Bachelor's degree or higher:12.33%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Health Insurance Coverage by Type (Private, Public, Uninsured)


Private Insurance:59.62%
Public Insurance:3261.54%
No Insurance:1528.85%
Total:52100%
Has Health Insurance:3771.15%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Percentage of People in Poverty Over Time (2011-2024)


Group20112102201320142015201620172018201920202021202220232024
% of People in Poverty85.7%57.1%0.0%0.0%10.0%8.7%9.1%29.4%36.4%29.6%47.6%56.5%16.7%0.0%
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.

School Enrollment by Education Level (Ages 3 and Older)


Nursery School, Preschool:00.00%
Kindergarten:00.00%
Elementary school (grades 1-8):00.00%
High school (grades 9-12):571.43%
College or graduate school:228.57%
Total:7100%
Early Childhood:00.00%
K-12 (Primary & Secondary School):571.43%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Business & Employment Statistics


ZIP Code 99691 is designated for PO Box delivery only; business establishment and employment data are not available.

# Residential Mailboxes:0Source: USPS
# Business Mailboxes:0Source: USPS
Total Delivery Receptacles:19Source: USPS
Single Family Delivery Units:0Source: USPS
Multi Family Delivery Units:0Source: USPS
# of Businesses:0Source: CBP
1st Quarter Payroll:$0Source: CBP
Annual Payroll:$0Source: CBP
# of Employees:0Source: CBP

Geography, Land Area, & Statistical Classifications


ZIP Code 99691 is located in Yukon Koyukuk Borough, Alaska, within the Metropolitan Statistical Area (CBSA ) and Alaska's 0th Congressional District. This area has a population of 0 people, about 0.00% of whom live in ZIP Code 99691. It covers 4624.961 sq mi of land and a water area of 18.563 sq mi.

CBSA Name:--Source: Census
CBSA Number:--Source: Census
CBSA Type:--Source: Census
CBSA Division:--Source: Census
CBSA Population:0Source: Census
MSA:Source: Census
Land Area:4624.961 sq miSource: Census
Water Area:18.563 sq miSource: Census
Congressional District:00Source: USPS
Congressional Land Area:571951.26 sq miSource: Census
PMSA:Source: Census
Intro Date:< 2004-10Source: ZIP-Codes.com
Place FIPS Code:0254150Source: Census
Place Name:Nikolai city; AlaskaSource: Census

Adjacent & Nearby ZIP Codes


99692 | | 99690

Schools in ZIP Code 99691


ZIP Code 99691 is in the Iditarod Area School District, which serves grades Pre-Kindergarten thru 12th. There are 1 public school(s) in this ZIP Code, and we have located 0 private school(s).

Top Of The Kuskokwim School 9190 Main St
Nikolai, AK 99691
District: Iditarod Area School District

Sources & References


Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on March 1, 2026.

  1. U.S. Postal Service [Last Updated: 3/1/2026], https://www.usps.com
  2. ZIP-Codes.com Proprietary Data Enhancements [Updated: 3/1/2026], https://www.zip-codes.com
  3. U.S. Census [Updated: Varies], https://www.census.gov
    • U.S. Census Office of Management and Budget [Updated: As Released]
    • U.S. Census 2020 Demographic & Housing Characteristics (DHC) [Decennial] [Updated: 5/25/2023]
    • U.S. Census 2011-2024 American Community Survey 5-year estimates (ACS) [Annually] [Updated: Annually, As Released]
    • U.S. Census Business Patterns (CBD) [Annually] [Updated: Annually, As Released]
    • U.S. Census American National Standards Institute (ANSI) [Updated: As Released]
  4. U.S. Geological Survey [Updated: Varies], https://www.usgs.gov
  5. Centers for Medicare & Medicaid Services [Updated: Annually, As Released], https://www.cms.gov
  6. National Center for Education Statistics [Updated: 3/1/2026], https://nces.ed.gov