| ZIP Codes: | 38 ZIP Codes (25 Standard, 5 PO Box, 8 Unique) [See All] |
| Area Code: | 785 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:15 PM |
| Population: | 178,325 [See All] |
| FIPS: | 20177 |
| CBSA: | Topeka, KS |
| Land Area: | 593 sq mi |
| Water Area: | 13 sq mi |
| Coordinates: | 39.0278, -95.7187 |
| Quick Link: |
178,325 residents live across 38 ZIPs covering 593 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 178,973 to 178,325 from 2014 to 2024 — a -0.4% change. 13 ZIPs gained residents, 11 lost.
The county's wealthiest ZIP 66610 (Topeka, $132,821 median) and poorest ZIP 66612 (Topeka, $26,067) are 10.3 miles apart — a 5.1× income gap across local geography.
Median home values vary 7.4× across this county — from $46,400 in 66607 (Topeka) to $341,100 in 66610 (Topeka).
Density varies 114× across the county — from 29 people/sq mi in 66546 (Wakarusa) to 3,304 in 66604 (Topeka).
Most of the decade's growth concentrated around Topeka — top growth ZIPs averaged +19.0% over the past ten years ( 66603 , 66619 and 66402 ).
Educational attainment ranges from 8.6% bachelor's+ in 66607 (Topeka) to 60.8% in 66610 (Topeka) — the breadth of educational profiles across the area.
Within Kansas, this is the #3 most populous of 106 counties and ranks #33 for median household income .
Hosts 4 single-entity Unique ZIPs: 66620Ks State Bd Of Health ; 66622Va Hospital ; 66636Security Benefit Life ; and 66630Usps Critical Parts .
Weighted by population, the typical household earns about $70,938 across the county — reflecting what a typical resident sees, not a simple ZIP average.
32.3% of adults age 25+ hold a bachelor's degree or higher (39,299 of 121,838 reporting). The most-educated ZIPs cluster around Topeka.
25 Standard delivery, 5 PO Box only, 8 single-entity Unique ZIPs serve this county.
1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
8 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 5.1× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 66614 | Topeka | Standard | 32,538 | $71,377 | 26.1 | 4.6% |
| 66604 | Topeka | Standard | 23,006 | $60,874 | 7.0 | 1.9% |
| 66605 | Topeka | Standard | 20,891 | $59,106 | 11.4 | 6.6% |
| 66618 | Topeka | Standard | 10,179 | $109,884 | 76.3 | 5.5% |
| 66607 | Topeka | Standard | 9,965 | $29,797 | 7.0 | -6.8% |
| 66610 | Topeka | Standard | 9,849 | $132,821 | 45.6 | 1.0% |
| 66606 | Topeka | Standard | 9,842 | $57,169 | 6.4 | -13.5% |
| 66611 | Topeka | Standard | 9,828 | $55,837 | 3.4 | 6.9% |
| 66617 | Topeka | Standard | 8,903 | $86,761 | 43.7 | -0.2% |
| 66609 | Topeka | Standard | 7,572 | $67,675 | 11.4 | -12.2% |
| 66616 | Topeka | Standard | 6,212 | $51,893 | 6.6 | 8.9% |
| 66608 | Topeka | Standard | 4,216 | $49,126 | 4.1 | -26.7% |
| 66619 | Topeka | Standard | 3,217 | $51,528 | 9.4 | 16.7% |
| 66409 | Berryton | Standard | 3,133 | $104,604 | 71.5 | 8.9% |
| 66402 | Auburn | Standard | 3,100 | $88,427 | 44.2 | 8.9% |
| 66539 | Silver Lake | Standard | 3,092 | $87,554 | 46.4 | 2.6% |
| 66542 | Tecumseh | Standard | 3,019 | $108,218 | 34.2 | -15.1% |
| 66615 | Topeka | Standard | 2,943 | $107,656 | 42.4 | -8.6% |
| 66603 | Topeka | Standard | 1,830 | $44,688 | 0.9 | 31.4% |
| 66612 | Topeka | Standard | 1,754 | $26,067 | 1.0 | -36.6% |
| 66533 | Rossville | Standard | 1,595 | $62,237 | 54.1 | 6.1% |
| 66546 | Wakarusa | Standard | 1,143 | $86,607 | 39.3 | -13.1% |
| 66621 | Topeka | Standard | 442 | — | 0.1 | -27.3% |
| 66622 | Topeka | Unique | 56 | — | 0.1 | -65.6% |
| 66647 | Topeka | PO Box | — | — | 0.0 | — |
| 66667 | Topeka | PO Box | — | — | 0.0 | — |
| 66620 | Topeka | Unique | — | — | 0.2 | — |
| 66630 | Topeka | Unique | — | — | 0.0 | — |
| 66624 | Topeka | Standard | — | — | 0.5 | — |
| 66420 | Dover | PO Box | — | — | 0.0 | — |
| 66675 | Topeka | PO Box | — | — | 0.0 | — |
| 66629 | Topeka | Unique | — | — | 0.0 | — |
| 66625 | Topeka | Unique | — | — | 0.0 | — |
| 66626 | Topeka | Unique | — | — | 0.0 | — |
| 66699 | Topeka | Unique | — | — | 0.0 | — |
| 66683 | Topeka | Standard | — | — | 0.0 | — |
| 66601 | Topeka | PO Box | — | — | 0.0 | — |
| 66636 | Topeka | Unique | — | — | 0.1 | — |