ZIP code · Knoxville · Iowa · United States
ZIP code 50138 — Knoxville
ZIP code 50138 serves Knoxville, Iowa.
- Postal code
- 50138Single source Value from one source, not cross-checked.
- City
- Knoxville
- County
- Marion FIPS 19125
- State
- Iowa
- Country
- United States
- Coordinates
- 41.3164, -93.0954 — precision precise (locality)
View on OpenStreetMap - Population
- 11,374 (ZCTA, ACS 5-year)
- Population density
- 68 / sq mi
- Land area
- 168.2 sq mi (435.5 km²) (ZCTA, ACS 5-year)
- Median household income
- $76,887
- Per-capita income
- $40,296
- Median age
- 42.8
- Households
- 4,764
- Housing units
- 5,181
- Median home value
- $169,900
- Median gross rent
- $815 / month
- Congressional district
- IA-1 (119th Congress)
- USDA hardiness zone
- 5b (-15 to -10 °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
- 641Telephone 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 50138 with another ZIP · ZIPs within 25 miles · distance from 50138
Map of ZIP code 50138
Climate — monthly normals
Warmest month Jul (avg high 85°F), coldest Jan (avg low 13°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 30 | 35 | 48 | 61 | 71 | 81 | 85 | 83 | 76 | 63 | 48 | 36 |
| Avg low °F | 13 | 17 | 28 | 39 | 51 | 61 | 66 | 63 | 54 | 42 | 30 | 19 |
| Precip in | 1.1 | 1.7 | 1.9 | 3.9 | 5.0 | 5.6 | 4.3 | 3.9 | 3.7 | 3.1 | 1.8 | 1.6 |
NOAA 1991–2020 climate normals from the nearest station: KNOXVILLE (0.6 mi) · NOAA NCEI
Places in ZIP 50138
- 11 schools
- 1 hospitals & clinics
- 3 doctors & dentists
- 1 pharmacies
- 3 supermarkets
- 6 restaurants & cafés
- 2 bars & pubs
- 12 parks
- 8 playgrounds
- 2 gyms & sports centres
- 1 libraries
- 1 post offices
- 28 places of worship
- 3 banks
- 4 gas stations
- 1 EV charging stations
- 3 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