ZIP code · Dewar · Iowa · United States
ZIP code 50623 — Dewar
ZIP code 50623 serves Dewar, Iowa.
- Postal code
- 50623Single source Value from one source, not cross-checked.
- City
- Dewar
- County
- Black Hawk FIPS 19013
- State
- Iowa
- Country
- United States
- Coordinates
- 42.5253, -92.2207 — precision precise (locality)
View on OpenStreetMap - Population
- 145 (ZCTA, ACS 5-year)
- Population density
- 70 / sq mi
- Land area
- 2.1 sq mi (5.4 km²) (ZCTA, ACS 5-year)
- Median household income
- $92,132
- Per-capita income
- $45,018
- Median age
- 62.6
- Households
- 69
- Housing units
- 69
- Median home value
- $170,500
- Congressional district
- IA-2 (119th Congress)
- USDA hardiness zone
- 5a (-20 to -15 °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
- 319 (from the nearest rate centre)Telephone 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 50623 with another ZIP · ZIPs within 25 miles · distance from 50623
Map of ZIP code 50623
Climate — monthly normals
Warmest month Jul (avg high 85°F), coldest Jan (avg low 11°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 28 | 33 | 47 | 61 | 73 | 82 | 85 | 83 | 77 | 63 | 47 | 34 |
| Avg low °F | 11 | 15 | 27 | 38 | 50 | 61 | 64 | 61 | 52 | 40 | 28 | 17 |
| Precip in | 1.1 | 1.1 | 2.0 | 4.0 | 4.6 | 5.7 | 4.3 | 4.2 | 3.1 | 2.8 | 1.9 | 1.4 |
NOAA 1991–2020 climate normals from the nearest station: WATERLOO MUNI AP (9.4 mi) · NOAA NCEI
Places in ZIP 50623
- 1 post offices
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