Data Last Updated: May 1, 2025

Clay County, IA ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Clay, IA.	16 ZIP Codes (7 General, 2 PO Box, 0 Unique, & 7 Multi County) [More Details]
Area Code: The Telephone Area Code that are associated with Clay, IA. Area Codes are used in the North American Numbering Plan (NANP) to facilitate phone routing. There are approximately 350 area codes in use in the United States.	712
Timezone: Time zone designation within the U.S. Please note that not all areas in the U.S. observe daylight saving time which can affect actual local time for this city. There are 7 standard time zones which are, from west to east: Hawaii-Aleutian, Alaska, Pacific, Mountain, Central, Eastern, Atlantic. Also included in U.S. Territories are Samoa, Guam and Palau.	Central
Local Time: The current local time for each timezone. If more than 1 time zone for this area, all local times will be shown. Counties can cross timezones, so more than 1 may be shown.	12:00:00 AM
Population: The population of Clay, IA from the U.S. Census 2020. Included are U.S. Citizens, permanent residents, temporary migrants, and undocumented individuals. The total population represents people who live in the city, not just those present while the Census was being completed.	16,384 [More Details]
FIPS: FIPS stands for Federal Information Processing Standards, which are a set of publicly announced standards for computer systems. A county FIPS code is a unique numeric identifier for a county in the United States, assigned by the National Institute of Standards and Technology (NIST). County FIPS codes have five digits, with the first two digits identifying the state and the last 3 indicating the county.	19041
CBSA: A Core Based Statistical Area (CBSA) is the recognized term for a region that functions around an urban core with a population of at least 10,000 people, according to the standards set by the Office of Management and Budget (OMB) in 2000. A CBSA is divided into two subsets: Metro and Micro, and these classifications are determined by population density. A Micro area is identified by a population ranging between 10,000 to 50,000, while a Metro area is defined as having a population that exceeds 50,000.	Spencer, IA
Land Area: The approximate amount of land area covered by Clay, IA in square miles. The Land Area provided by the Census Bureau is based on geographic boundaries that include the mainland, islands, inland, coastal, Great Lakes, and territorial waters associated with each city.	567 square miles
Water Area: The approximate amount of water area covered by Clay, IA in square miles. Calculations by the Census Bureau for Water Area take into account inland bodies of water, coastal regions, Great Lakes, and territorial sea waters. This encompasses features such as lakes, reservoirs, rivers, and coastal water bodies.	5 square miles
Coordinates: The latitude/longitude centroid coordinates for Clay County, IA.	-95.150937, 43.082568
Quick Link: Copy the direct link to the Clay, IACounty page and use anywhere you like!	https://www.zip-codes.com/county/ia-clay.asp

Clay, IA ZIP Code Boundaries

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Clay County, IA Covers 16 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 50515 *	General	Ayrshire	253	--
ZIP Code 50585 *	General	Sioux Rapids	1,118	--
ZIP Code 51033 *	General	Linn Grove	428	--
ZIP Code 51047	General	Peterson	588	3.59%
ZIP Code 51058 *	General	Sutherland	972	--
ZIP Code 51301	General	Spencer	12,606	76.94%
ZIP Code 51333	General	Dickens	440	2.69%
ZIP Code 51338	General	Everly	950	5.80%
ZIP Code 51340	P.O. Box	Fostoria	90	0.55%
ZIP Code 51341	P.O. Box	Gillett Grove	34	0.21%
ZIP Code 51343	General	Greenville	263	1.61%
ZIP Code 51346 *	General	Hartley	2,343	--
ZIP Code 51357	General	Royal	611	3.73%
ZIP Code 51358 *	General	Ruthven	1,274	--
ZIP Code 51364 *	General	Terril	616	--
ZIP Code 51366	General	Webb	377	2.30%

* Indicates a Multi County ZIP Code. These ZIP Codes partially cross over into Clay, IA, but will mostly cover area in a different County. Not included in % of Population calculations.

Important Clay, IA Information

Clay County, IA Covers 16 ZIP Codes. This includes 7 General ZIP Codes, 2 PO Box ZIP Codes, and 0 Unique (reserved for Business and Volume Mail Receivers). There are also 7 Multi County ZIP Codes. These records are assigned a different primary county, but they partially cover area in Clay County.

The population for Clay County is 16,384, according to the U.S. Census. Population Density is 28.90 persons per square mile. With 8,109 Housing Units, the Average Household Size is 2.23 persons. There are 7,222 Family Households with an Average Family Size of 2.86 persons. 4.02% of the population is without Health Insurance. The 63.15% Employment Rate is 3.35% above the national average of 59.8%.11,387 people aged 25+ have some educational achievement, with 26.04% (or 2,965 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

712 is the only area code for this area. Clay is also located in the Central timezone and the current local time is shown above.

Clay is part of the Spencer, IA Core Based Statistical Area (CBSA). Its CBSA Code is 43980.It is classified as a micro area, which means it has an urban core of at least 10,000 but less then 50,000 people.

CBSAs are defined by the OMB as geographic areas that have at least one core with a population of 10,000 or more and adjacent territory with a high degree of social and economic integration. CBSA codes are commonly used to accurately file Medicare claims and to verify applicable incentives using a patient's ZIP Code.

ZIP Codes in Clay, IA have 6,798 Residential mailboxes and 456 Business mailboxes.There are 564 businesses with a total of 7,054 employees. That is an average of 12.5 employees per business. Annual payroll for these businesses is $312,902,000. Other Demographics

Clay County Demographic Profile

Population & People

Total Population

16,384

Income

Median Household Income

$64,082

Housing

Total Housing Units

8,109

Health

Without Healthcare Coverage

4.02%

Business & Economy

Total Businesses

564

Families

Total Households

7,222

Employment

Employment Rate

63.15%

Education

Bachelor's Degree or Higher

26.04%

Total Population: Total number of people from the 2020 U.S. Census for Clay, IA. This reflects the exact count of this area at that point in time, not future estimates, regardless of citizenship or immigration status. It is intended to count all persons living within the geographic area, not just those present on the day of the census.	16,384
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Clay, IA. This is derived from known delivery information, household occupancy rates, household size, and more to come up with an accurate estimation for the current population. IMPORTANT: This does not include population totals for persons in nursing homes, correctional facilities, or other institutions. This is an estimation of the household population based on US Postal Service delivery information.	15,128
Total Households: Total number of Households from the 2020 U.S. Census for Clay, IA. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	7,222
Total Housing Units: The total number of Housing Units is the number of occupied units + the number of vacant units. Ownership is defined by whether the unit is occupied by an owner or by a tenant. Owner occupancy means that the owner lives in the unit. This value comes from the 2020 U.S. Census and is not a projection or estimate.	8,109
Average Household Size: The Average Household Size, is obtained by dividing the number of people in Households (excluding those in group quarters, nursing home, prisons, and dorm rooms) by the number of Households. A Household includes everyone living in a residential unit. Those who do not live in a household are classified as living in group accommodation. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.23
Average Family Size: Average Family Size is calculated by dividing the number of people in a Family Household by the number of Family Households. The U.S. Census Bureau defines family households as households consisting of two or more individuals who are related by birth, marriage, or adoption. They also may include other unrelated people. Non-family households consist of people who live alone or who share their residence with unrelated individuals. The Average Family Size only looks at the households classified as Family Households. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.86

Other Clay Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	6,798
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	456
Total Delivery Receptacles: The total number of delivery receptacles. This includes curb side mailboxes, centralized units, PO Boxes, NDCBU, and contract boxes. This count is for Residential and Business combined.	9,463
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	5,603
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	955

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	564
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$72,990,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$312,902,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	7,054

Sum of all ZIP Codes assigned Clay, IA as their primary County.

References

U.S. Postal Service [Last Updated: 5/1/2025], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 5/1/2025], https://www.zip-codes.com
U.S. Geological Survey [Updated as needed], https://www.usgs.gov
U.S. Census [Updated Yearly], https://www.census.gov
U.S. Census 2020 [Decennial] [Last Updated: 5/25/2023], https://www.census.gov