ZIP code · Walnut · Kansas · United States
ZIP code 66780 — Walnut
ZIP code 66780 serves Walnut, Kansas.
- Postal code
- 66780Single source Value from one source, not cross-checked.
- City
- Walnut
- County
- Crawford FIPS 20037
- State
- Kansas
- Country
- United States
- Coordinates
- 37.5967, -95.0455 — precision precise (locality)
View on OpenStreetMap - Population
- 624 (ZCTA, ACS 5-year)
- Population density
- 6 / sq mi
- Land area
- 103.8 sq mi (268.9 km²) (ZCTA, ACS 5-year)
- Median household income
- $80,443
- Per-capita income
- $38,071
- Median age
- 47.4
- Households
- 261
- Housing units
- 296
- Median home value
- $154,500
- Median gross rent
- $438 / month
- Congressional district
- KS-2 (119th Congress)
- USDA hardiness zone
- 7a (0 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
- 620Telephone 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 66780 with another ZIP · ZIPs within 25 miles · distance from 66780
Map of ZIP code 66780
Climate — monthly normals
Warmest month Jul (avg high 90°F), coldest Jan (avg low 22°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 42 | 47 | 57 | 67 | 76 | 85 | 90 | 89 | 81 | 69 | 56 | 45 |
| Avg low °F | 22 | 26 | 36 | 45 | 56 | 65 | 69 | 68 | 59 | 47 | 35 | 27 |
| Precip in | 1.8 | 1.9 | 3.5 | 4.8 | 6.5 | 5.4 | 3.9 | 3.9 | 4.8 | 3.8 | 3.0 | 2.3 |
NOAA 1991–2020 climate normals from the nearest station: GIRARD (12.9 mi) · NOAA NCEI
Places in ZIP 66780
- 1 restaurants & cafés
- 1 places of worship
- 1 gas stations
- 2 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