Iowa · Census place 1959115
Onawa, Iowa
Onawa is a city in Monona County, Iowa with an estimated 2,795 residents on July 1, 2024. It is the 128th largest of 273 incorporated places of 1,000+ people in the state.
- Population 2024
- 2,795
- #128 of 273 in Iowa
- Change since 2020
- -3.8%
- -109 people
- Land area
- 5.3 sq mi
- Density
- 530 / sq mi
- State median 1,363
Measure from here
Tools and pages that start from Onawa
Onawa population, 2020 to 2024
Onawa lost 109 residents from July 2020 to July 2024, a change of -3.8%. In the latest year it moved by -25.
Onawa covers 5.27 square miles of land, for 530 people per square mile of land. The median Iowa place of 5,000+ has 1,363, so Onawa is less dense than the typical town.
What county Onawa is in
All of Onawa's residents live in Monona County, which had 8,429 residents in 2024. Onawa holds 33.2% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.
ZIP codes in Onawa
1 ZIP Code Tabulation Area (ZCTA) overlaps Onawa by at least 10% of the ZCTA's or the city's land: 51040. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.
Where Onawa is
The Census internal point of Onawa is at 42.026500, -96.090900. Des Moines, the capital, is 131.6 miles ESE in a straight line. The nearest larger place is Sergeant Bluff, IA (5,335 people), 28.9 miles away. The nearest city of 100,000 or more is Omaha, NE, 52.8 miles away.
Internal point
- Decimal
- 42.026500, -96.090900
- DMS
- 42°01'35.40"N 96°05'27.24"W
- UTM
- 14N 740835.7E 4656813.5N
- Geohash
- 9z7xj6swp
- Plus code
- 86J52WG5+JJ
Daylight in Onawa
At 42.03° N, Onawa gets about 15 h 15 min of daylight around the June solstice and 9 h 07 min around the December solstice, a swing of 6 h 08 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.
Places near Onawa
The eight nearest incorporated places of 1,000+ in Iowa, measured between internal points. The closest is Sloan, 15.8 miles away, with 1,078 people.
Questions people ask
What is the population of Onawa, IA?
2,795 on July 1, 2024, in the Census Vintage 2024 estimates. That is down 109 (3.8%) from 2,904 in July 2020.
What county is Onawa in?
Monona County. All of its residents live in that county.
What ZIP codes cover Onawa?
1 ZIP Code Tabulation Area overlaps it by at least 10% of either area: 51040.
How far is Onawa from Des Moines?
131.6 miles (211.7 km) in a straight line, heading ESE from Onawa.
What is the nearest larger city to Onawa?
Sergeant Bluff, IA, with 5,335 residents, 28.9 miles away between internal points.
Sources and data as of
Data as of: Census Vintage 2024 subcounty estimates (July 1, 2024), 2024 Gazetteer places, 2020 ZCTA to place relationship file.
- 01Census Vintage 2024 subcounty population estimates
- 02Census 2024 Gazetteer, places
- 03Census 2020 ZCTA to place relationship file
- 04Census 2024 cartographic boundary file, counties (1:5,000,000)
How every number is computed: methodology. Spotted a wrong figure? Report an error.