ZIP Codes of Kay County, OK

Population & People
Population & People
Total Population
46,432
Household Income
Household Income
Median Income
$68,736
Housing
Housing
Total Housing Units
22,146
Business & Economy
Business & Economy
Total Businesses
1,078
Employment
Employment
Employment Rate
55.15%
Education
Education
Bachelor's Degree+
19.28%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 9 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:9 ZIP Codes (8 Standard, 1 PO Box, 0 Unique) [See All]
Area Codes:539 / 580 / 918
Timezone:Central (GMT -06:00)
Local Time:2:13:25 PM
Population:46,432 [See All]
FIPS:40071
CBSA:Ponca City, OK
Land Area:1,006 sq mi
Water Area:23 sq mi
Coordinates:36.7803, -97.1690
Quick Link:
https://www.zip-codes.com/county/ok-kay.asp
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Oklahoma's #17 most populous county
46,432 residents across 9 ZIPs — #17 of 78 Oklahoma counties.

Standout ZIPs in this County


Most Populous
Ponca City · 18,916 people
40.7% of county total
Highest Income
Nardin · $90,473 median
1.3× county average
Largest Land Area
Newkirk · 280.8 sq mi
Spans the most ground
Fastest Growth
Ponca City · 0.5% (10-yr)
12,126 → 12,189 residents
Most Educated
Ponca City · 29.1% bachelor's+
2,536 of 8,725 adults 25+

Things worth knowing about Kay County


46,432 residents live across 9 ZIPs covering 1,006 sq mi, served by 7 distinct USPS-recognized cities.

Population moved from 48,730 to 46,432 from 2014 to 2024 — a -4.7% change. 1 ZIPs gained residents, 7 lost.

The county's wealthiest ZIP 74646 (Nardin, $90,473 median) and poorest ZIP 74601 (Ponca City, $52,067) are 18.0 miles apart — a 1.7× income gap across local geography.

Median home values vary 2.4× across this county — from $86,500 in 74631 (Blackwell) to $210,000 in 74604 (Ponca City).

Density varies 24× across the county — from 5 people/sq mi in 74646 (Nardin) to 119 in 74601 (Ponca City).

Educational attainment ranges from 8.9% bachelor's+ in 74641 (Kaw City) to 29.1% in 74604 (Ponca City) — the breadth of educational profiles across the area.

Within Oklahoma, this is the #17 most populous of 78 counties and ranks #17 for median household income .

Weighted by population, the typical household earns about $61,958 across the county — reflecting what a typical resident sees, not a simple ZIP average.

19.3% of adults age 25+ hold a bachelor's degree or higher (5,974 of 30,993 reporting).

8 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Kay County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
1,006
square miles
Avg density
46.2
people per sq mi
Population
46,432
across 9 ZIPs
Newkirk
280.8 sq mi
3,534 residents
Ponca City
158.6 sq mi
18,916 residents
Ponca City
138.7 sq mi
12,189 residents

All ZIP Codes in Kay County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
74601Ponca CityStandard18,916$52,067158.6-5.4%
74604Ponca CityStandard12,189$80,331138.70.5%
74631BlackwellStandard6,689$53,964103.6-11.5%
74653TonkawaStandard3,710$59,079104.9-4.5%
74647NewkirkStandard3,534$63,145280.8-1.9%
74632BramanStandard553$88,750106.7-14.4%
74641Kaw CityStandard552$62,08353.7-5.3%
74646NardinStandard289$90,47358.8-13.0%
74602Ponca CityPO Box0.0

Adjacent & Nearby Counties