| City: | Elk Mills, Maryland |
| County: | Cecil County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 10:03:46 PM |
| Population: | 555 [See All] |
| Area Codes: | 410 / 443 / 667 |
| Classification: | PO Box |
| Coordinates: | 39.6610, -75.8284 |
| Land Area: | 0.989 sq mi |
| Quick Link: |
Elk Mills is a small rural community in northeastern Cecil County, Maryland, where 555 residents rely exclusively on PO Box mail delivery. This is a PO Box Only Zone. There's no street delivery option across the 0.34 square mile area, and the 144 PO Boxes at the post office serve 62% of the 231 households.
The post office operates rural carrier routes covering seven roads, with Elk Mills Road handling the most delivery points (23 records). Other local roads include Baldwin Church Road, Hebron Court, and Hebron Hill Road. Three streets have apartment buildings, while the remaining roads serve single-family homes.
Elk Mills isn't a typical rural area. Median household income is $119,156, well above the Maryland average. The community is primarily residential, with just 3 business establishments and only 4 employees. What stands out is the work pattern: 41% of workers (139 of 342) work from home, and a significant number work in transportation and warehousing (369 workers listed, likely commuters to nearby ports or logistics centers).
The community has deep roots. Of the 246 total housing units, 352 were built before 1939 (this figure exceeds total units, suggesting reconstruction or Census data anomalies). Homeownership is common, with 157 owner-occupied units and 74 rentals. Median age is 45.9 years. The population is 90% White, with 13% Hispanic or Latino residents.
All mail to Elk Mills addresses must use a PO Box. The format is:
PO Box [Number]
Elk Mills, MD 21920Seven rural roads with traditional names like Elk Mills Road and Baldwin Church Road. Three streets have apartments, indicating some multi-family housing.
ZIP Code 21920 has 555 residents and 231 households (average 2.40 persons per household). The median age is 45.9 years, significantly older than the state (38.8) and significantly older than the nation (38.8). The gender split is 57.7% male and 42.3% female, which is much higher than the state male share (48.2%), making this a male-majority area. Largest groups are White (89.7%, much higher than the state average of 48.7% and well above the national average of 61.6%) and Hispanic or Latino (4.1%); Hispanic or Latino residents make up 4.1%, which is much lower than the national average (18.7%).
Explore More: Population Over Time By Age & Gender By Race By Gender Nativity & Citizenship
| 2020 Population: | 555Source: Census DHC |
| 2024 ACS Population Estimate: | 1,413Source: Census ACS |
| 2026 ZC Population Estimate: | 0Source: ZIP-Codes.com |
| Population Density: | 561.2 people per sq mile |
| Average Income: | $124,146Source: Census ACS |
| Households: | 231Source: Census DHC |
| Average House Value: | $356,000Source: Census ACS |
| Persons Per Household: | 2.40Source: Census DHC |
| Average Family Size: | 2.73Source: Census ACS |
| Group | 2010 | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census ACS Population Estimate | -- | 113 | 124 | 167 | 231 | 214 | 353 | 352 | 515 | 491 | 953 | 910 | 1,089 | 1,153 | 1,413 |
| Decennial Census | 257 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 555 | -- | -- | -- | -- |
Median Age: 45.9
Male Median Age: 44.6
Female Median Age: 49.9
| Group | < 5 | 5-9 | 10-14 | 15-19 | 20-24 | 25-29 | 30-34 | 35-39 | 40-44 | 45-49 | 50-54 | 55-59 | 60-64 | 65-69 | 70-74 | 75-79 | 80-84 | 85+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male | 13 | 25 | 11 | 5 | 6 | 30 | 30 | 26 | 18 | 7 | 29 | 8 | 42 | 26 | 17 | 20 | 6 | 1 |
| Female | 14 | 5 | 21 | 11 | 3 | 5 | 9 | 31 | 10 | 9 | 3 | 36 | 23 | 13 | 18 | 6 | 7 | 11 |
| Total | 27 | 30 | 32 | 16 | 9 | 35 | 39 | 57 | 28 | 16 | 32 | 44 | 65 | 39 | 35 | 26 | 13 | 12 |
| White: | 498 | 89.73% |
| Black: | 19 | 3.42% |
| Hispanic:* | 23 | 4.14% |
| Asian: | 5 | 0.90% |
| American Indian: | 2 | 0.36% |
| Hawaiian: | 0 | 0% |
| Other: | 8 | 1.44% |
| Total: | 555 | 100% |
| Gender | Count | % | Median Age |
|---|---|---|---|
| Males: | 320 | 57.66% | 44.6 years |
| Females: | 235 | 42.34% | 49.9 years |
| Total: | 555 | 100% | 45.9 years |
| Native, born in the United States: | 1,316 | 93.14% |
| Native, born in PR, Island Areas, or abroad: | 0 | 0.00% |
| Foreign born, naturalized U.S. citizen: | 79 | 5.59% |
| Foreign born, not a U.S. citizen: | 18 | 6.86% |
| Total Population: | 1,413 | 100% |
| Total Native Population: | 1,316 | 93.14% |
| Total Foreign-born Population: | 97 | 6.86% |
In 2024, the Median household income is $124,146, which is far above the national median ($78,538), is up $75,540 (155.4%) since 2011 and above its 2019 pre-pandemic level by $89,424. Family households earn a median of $133,214 versus $71,538 for nonfamily households (a difference of $61,676). By gender, male median income is $66,711 and female is $57,064, which is much lower than the state female median ($68,044), with a current gap of $9,647 that has widened from 2011 to 2024. The labor-force participation rate is 62.6%, which is falls short of the state rate (67.2%). The unemployment rate is 0.0%, which is markedly below the national rate (5.2%). The largest occupation group is Management (32.8%).
Explore More: Income Over Time Household Income Employment Status By Occupation
| Income Type | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Household Income | $48,606 | $30,893 | $31,833 | $34,635 | $33,533 | $33,385 | $36,400 | $40,781 | $34,722 | $74,318 | $83,833 | $113,687 | $119,156 | $124,146 |
| Median Family Income | $49,087 | $50,769 | $42,500 | $56,023 | $0 | $0 | $40,188 | $41,700 | $42,850 | $82,857 | $105,678 | $114,304 | $119,484 | $133,214 |
| Median NonFamily Income | $0 | $24,071 | $0 | $32,902 | $32,888 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $71,538 |
| Median Male Income | $0 | $0 | $0 | $0 | $0 | $75,430 | $0 | $41,300 | $31,944 | $42,949 | $49,464 | $64,931 | $93,140 | $66,711 |
| Median Female Income | $0 | $0 | $0 | $0 | $0 | $50,458 | $0 | $0 | $0 | $0 | $48,292 | $53,841 | $55,931 | $57,064 |
| Employed: | 680 | 62.62% |
| Unemployed: | 0 | 0.00% |
| Not In Labor Force: | 406 | 37.38% |
| Total: | 1,086 | 100% |
| Management, business, science, and arts: | 223 | 32.79% |
| Service: | 126 | 18.53% |
| Sales and Office: | 166 | 24.41% |
| Natural resources, construction, and maintenance: | 54 | 7.94% |
| Production, transportation, and material moving: | 111 | 16.32% |
| Total Civilian Employed Population: | 680 | 100% |
In 2024, the median home value is $356,000, which is considerably higher than the national median ($303,400), is up $277,400 (352.93%) since 2011 and above its 2019 pre-pandemic level by $356,000. The median gross rent is $1,346, which is well under the state median ($1,662), and above its 2019 pre-pandemic level by $1,346. Of occupied housing, owners make up 65.37% (56.49% with a mortgage, 43.51% free-and-clear) and renters 34.63% - making this ZIP Code less home ownership than the state and under national rental averages. The vacancy rate is 0.00%, which is much lower than the national rate (10.43%).
Explore More: Compare Home Value Home Value Over Time Rent & Over Time Housing Occupancy
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Home Value | $78,600 | $405,700 | $285,400 | $207,100 | $208,600 | $202,700 | $160,000 | $163,500 | $0 | $319,000 | $332,300 | $360,300 | $338,600 | $356,000 |
| Less than $500: | 0 | 0.00% |
| $500 to $999: | 0 | 0.00% |
| $1,000 to $1,499: | 117 | 77.48% |
| $1,500 to $1,999: | 0 | 0.00% |
| $2,000 to $2,499: | 0 | 0.00% |
| $2,500 to $2,999: | 0 | 0.00% |
| $3,000 or more: | 0 | 0.00% |
| No Rent: | 34 | 22.52% |
| Total: | 151 | 100% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Rent | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $1,346 |
| Owner Occupied (with mortgage): | 161 | 36.93% |
| Owner Occupied (free and clear, no mortgage): | 124 | 28.44% |
| Renter Occupied: | 151 | 34.63% |
| Total Occupied Housing Units: | 436 | 100% |
| Occupied Housing Units: | 436 | 100.00% |
| Vacant Housing Units (not graphed): | 0 | 0.00% |
| Total Housing Units: | 436 | 100% |
| Single-Family Units: | 436 | 100.00% |
| Multi-Family Units: | 0 | 0.00% |
| Other Units: | 0 | 0.00% |
| Total Housing Units: | 436 | 100% |
In 2024, 22.40% of adults (25+) have a bachelor's degree or higher, which is markedly below the state rate (42.70%). High school or higher is 79.10%, which is on par with the state rate (91.00%). The uninsured rate is 3.00%, which is far lower than the national rate (8.60%). Public coverage is 22.70%, which is falls below the national rate (36.30%). The share of people in poverty is 7.70%, which is on par with the state rate (6.30%), up 4.10 percentage points since 2011 and below its 2019 pre-pandemic level by 12.70 percentage points. This signals a sharp increase in hardship - a shrinking consumer base, heavy pressure on public services, and job-market contraction risks. Among residents ages 3+, the largest enrollment group is elementary (56.53%). College enrollment is 8.79%, which is markedly below the state rate (28.00%), indicating the community may be more oriented toward vocational/trade or direct-to-workforce opportunities.
Explore More: Educational Attainment Health Insurance Poverty Over Time School Enrollment
| Less than 9th grade: | 0 | 0.00% |
| 9th to 12th grade, no diploma: | 192 | 20.89% |
| High school graduate (includes equivalency): | 317 | 34.49% |
| Some college, no degree: | 138 | 15.02% |
| Associate's degree: | 66 | 7.18% |
| Bachelor's degree: | 162 | 17.63% |
| Graduate or professional degree: | 44 | 4.79% |
| Total: | 919 | 100% |
| High school or higher: | 727 | 79.11% |
| Bachelor's degree or higher: | 206 | 22.42% |
| Private Insurance: | 1,156 | 76.10% |
| Public Insurance: | 321 | 21.13% |
| No Insurance: | 42 | 2.76% |
| Total: | 1,519 | 100% |
| Has Health Insurance: | 1,477 | 97.24% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % of People in Poverty | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 8.7% | 8.2% | 12.5% | 16.8% | 12.2% | 0.0% | 0.0% | 4.1% | 7.7% |
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.
| Nursery School, Preschool: | 0 | 0.00% |
| Kindergarten: | 61 | 14.49% |
| Elementary school (grades 1-8): | 238 | 56.53% |
| High school (grades 9-12): | 85 | 20.19% |
| College or graduate school: | 37 | 8.79% |
| Total: | 421 | 100% |
| Early Childhood: | 61 | 14.49% |
| K-12 (Primary & Secondary School): | 384 | 91.21% |
ZIP Code 21920 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: | 339Source: 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 |
ZIP Code 21920 is located in Cecil County, Maryland, within the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD Metropolitan Statistical Area (CBSA 37980) and Maryland's 1st Congressional District. This Metro area has a population of 5,965,343 people, about 0.01% of whom live in ZIP Code 21920, and is subdivided into the Wilmington, DE-MD-NJ division. It covers 0.989 sq mi of land and a water area of 0.007 sq mi.
| CBSA Name: | Philadelphia-Camden-Wilmington, PA-NJ-DE-MDSource: Census |
| CBSA Number: | 37980Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | Wilmington, DE-MD-NJ (CBSA Div 48864)Source: Census |
| CBSA Population: | 5,965,343Source: Census |
| MSA: | Philadelphia-Wilmington-Atlantic City, PA-NJ-DE-MD CMSASource: Census |
| Land Area: | 0.989 sq miSource: Census |
| Water Area: | 0.007 sq miSource: Census |
| Congressional District: | 01Source: USPS |
| Congressional Land Area: | 3977.06 sq miSource: Census |
| PMSA: | Wilmington-Newark, DE-MD PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | --Source: Census |
| Place Name: | --Source: Census |
We could not locate which school district 21920 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
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 February 1, 2026.