Iowa · Census place 1901585
Alton, Iowa
Alton is a city in Sioux County, Iowa with an estimated 1,248 residents on July 1, 2024. It is the 235th largest of 273 incorporated places of 1,000+ people in the state.
- Population 2024
- 1,248
- #235 of 273 in Iowa
- Change since 2020
- +0.8%
- +10 people
- Land area
- 1.9 sq mi
- Density
- 653 / sq mi
- State median 1,363
Measure from here
Tools and pages that start from Alton
Alton population, 2020 to 2024
Alton added 10 residents from July 2020 to July 2024, a change of +0.8%. In the latest year it moved by +11.
Alton covers 1.91 square miles of land, for 653 people per square mile of land. The median Iowa place of 5,000+ has 1,363, so Alton is less dense than the typical town.
What county Alton is in
All of Alton's residents live in Sioux County, which had 36,554 residents in 2024. Alton holds 3.4% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.
ZIP codes in Alton
1 ZIP Code Tabulation Area (ZCTA) overlaps Alton by at least 10% of the ZCTA's or the city's land: 51003. 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 Alton is
The Census internal point of Alton is at 42.987700, -96.009500. Des Moines, the capital, is 156.3 miles SE in a straight line. The nearest larger place is Orange City, IA (6,547 people), 2.5 miles away. The nearest city of 100,000 or more is Sioux Falls, SD, 52.8 miles away.
Internal point
- Decimal
- 42.987700, -96.009500
- DMS
- 42°59'15.72"N 96°00'34.20"W
- UTM
- 14N 743807.3E 4763789.3N
- Geohash
- 9zesx38j8
- Plus code
- 86J5XXQR+36
Daylight in Alton
At 42.99° N, Alton gets about 15 h 22 min of daylight around the June solstice and 9 h 00 min around the December solstice, a swing of 6 h 21 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.
Places near Alton
The eight nearest incorporated places of 1,000+ in Iowa, measured between internal points. The closest is Orange City, 2.5 miles away, with 6,547 people.
Questions people ask
What is the population of Alton, IA?
1,248 on July 1, 2024, in the Census Vintage 2024 estimates. That is up 10 (0.8%) from 1,238 in July 2020.
What county is Alton in?
Sioux County. All of its residents live in that county.
What ZIP codes cover Alton?
1 ZIP Code Tabulation Area overlaps it by at least 10% of either area: 51003.
How far is Alton from Des Moines?
156.3 miles (251.5 km) in a straight line, heading SE from Alton.
What is the nearest larger city to Alton?
Orange City, IA, with 6,547 residents, 2.5 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.