Janesville, Iowa

Janesville population, 2020 to 2024

Janesville added 15 residents from July 2020 to July 2024, a change of +1.4%. In the latest year it moved by +5.

Janesville covers 1.39 square miles of land and 0.06 of water, for 757 people per square mile of land. The median Iowa place of 5,000+ has 1,363, so Janesville is less dense than the typical town.

The 2 counties Janesville spans

Janesville crosses county lines. The Census county-part estimates split its 1,052 residents as follows; Bremer County holds 89.2% of them. The shaded shapes are on the map above; dots mark the eight nearest places.

ZIP codes in Janesville

1 ZIP Code Tabulation Area (ZCTA) overlaps Janesville by at least 10% of the ZCTA's or the city's land: 50647. 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 Janesville is

The Census internal point of Janesville is at 42.645800, -92.462400. Des Moines, the capital, is 93.5 miles SW in a straight line. The nearest larger place is Waverly, IA (10,576 people), 5.3 miles away. The nearest city of 100,000 or more is Cedar Rapids, IA, 61.8 miles away.

Daylight in Janesville

At 42.65° N, Janesville gets about 15 h 19 min of daylight around the June solstice and 9 h 03 min around the December solstice, a swing of 6 h 17 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Janesville

The eight nearest incorporated places of 1,000+ in Iowa, measured between internal points. The closest is Waverly, 5.3 miles away, with 10,576 people.