Wisconsin to Illinois

Distance from Green Bay to Rockford

Straight-line distance

165.4mi

Green Bay, WI and Rockford, IL are 165.4 miles (266.2 km) apart in a straight line. From Green Bay, the shortest path starts out heading SSW (199°).

kilometers
266.2
nautical miles
143.7
heading from Green Bay
199° SSW
heading from Rockford
19° NNE
Green BayRockford

Orange line: great-circle path · ring: midpoint · thin lines: county borders

How far Green Bay is from Rockford

The great-circle distance between the Census internal points of Green Bay and Rockford is 165.4 miles, 266.2 km or 143.7 nautical miles. That is the shortest path over the Earth's surface, computed with the haversine formula on a sphere with the mean Earth radius, 6,371.0 km. A course held on one compass bearing (a rhumb line) would be 165.4 miles, practically the same at this range.

Measurements

Miles
165.4
Kilometers
266.2
Nautical miles
143.7
Bearing from Green Bay
199.5° SSW
Bearing arriving at Rockford
198.7°
Bearing from Rockford
18.7° NNE

Halfway between Green Bay and Rockford

The great-circle midpoint is at 43.391663, -88.535100 (43°23'29.99"N 88°32'6.36"W). The nearest incorporated place of 1,000 or more people is Hustisford, WI, with 1,074 residents, 4.8 miles from the midpoint. To find towns near the midpoint of any two places, use the halfway tool.

Time zones and daylight

Both use America/Chicago, so there is no time difference. On June 21, Green Bay gets 15 h 33 min of daylight and Rockford 15 h 16 min; on December 21, 8 h 49 min and 9 h 05 min. Green Bay is 2.26° farther north, so it has the longer summer days and the shorter winter ones.

Population compared

Rockford has 1.4 times the population of Green Bay. From July 2020 to July 2024, Green Bay changed by -0.9% and Rockford by -0.8%. The trip crosses from Wisconsin into Illinois.

  1. 01Green Bay, WI106,311 (-0.9%)
  2. 02Rockford, IL147,486 (-0.8%)
July 1, 2024 population and change since July 2020, Census Vintage 2024.

Questions people ask

How far is Green Bay from Rockford?

165.4 miles, 266.2 km or 143.7 nautical miles along the great circle between the two Census internal points. Road distance is longer.

Which direction is Rockford from Green Bay?

SSW. The great-circle path leaves Green Bay on a bearing of 199.5° and arrives at Rockford on 198.7°. The return trip starts on 18.7°.

What is halfway between Green Bay and Rockford?

The midpoint is at 43.391663, -88.535100. The nearest incorporated place of 1,000+ is Hustisford, WI, 4.8 miles from it.

Is there a time difference between Green Bay and Rockford?

Both use America/Chicago, so there is no time difference.

Which is bigger, Green Bay or Rockford?

Rockford, with 147,486 residents in July 2024 against 106,311 for Green Bay, 1.4 times as many.

Sources and data as of

Data as of: Census 2024 Gazetteer internal points and Vintage 2024 estimates; time zones from Open-Meteo.

  1. 01Census 2024 Gazetteer, places
  2. 02Census Vintage 2024 subcounty population estimates
  3. 03SunCalc library (Vladimir Agafonkin), algorithms after Jean Meeus
  4. 04IANA time zone database (clock times and daylight saving rules)

How every number is computed: methodology. Spotted a wrong figure? Report an error.