ZIP code · Seneca · Kansas · United States
ZIP code 66538 — Seneca
ZIP code 66538 serves Seneca, Kansas.
- Postal code
- 66538Single source Value from one source, not cross-checked.
- City
- Seneca
- County
- Nemaha FIPS 20131
- State
- Kansas
- Country
- United States
- Coordinates
- 39.8473, -96.0316 — precision precise (locality)
View on OpenStreetMap - Population
- 3,577 (ZCTA, ACS 5-year)
- Population density
- 26 / sq mi
- Land area
- 136.8 sq mi (354.3 km²) (ZCTA, ACS 5-year)
- Median household income
- $77,076
- Per-capita income
- $36,987
- Median age
- 41
- Households
- 1,371
- Housing units
- 1,506
- Median home value
- $252,900
- Median gross rent
- $696 / month
- Congressional district
- KS-2 (119th Congress)
- USDA hardiness zone
- 6a (-10 to -5 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Chicago (UTC−6 / UTC−5 DST)
- Area code
- 785Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 66538 with another ZIP · ZIPs within 25 miles · distance from 66538
Map of ZIP code 66538
Climate — monthly normals
Warmest month Jul (avg high 87°F), coldest Jan (avg low 15°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 35 | 39 | 53 | 63 | 73 | 83 | 87 | 85 | 78 | 66 | 51 | 39 |
| Avg low °F | 15 | 18 | 29 | 39 | 52 | 62 | 65 | 63 | 53 | 41 | 29 | 20 |
| Precip in | 0.6 | 1.0 | 2.1 | 3.2 | 4.3 | 4.0 | 3.7 | 3.4 | 2.5 | 2.6 | 1.8 | 1.3 |
NOAA 1991–2020 climate normals from the nearest station: BAILEYVILLE (8.1 mi) · NOAA NCEI
Places in ZIP 66538
- 9 schools
- 1 hospitals & clinics
- 9 restaurants & cafés
- 3 parks
- 2 playgrounds
- 3 places of worship
- 1 banks
- 2 gas stations
- 5 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page