Black Hawk Township, Grundy County, Iowa
Black Hawk Township is a township in Grundy County, Iowa. About 1,962 people live there (2020–2024 estimate). It covers 36.2 sq mi (93.8 km²) of land and uses Central Time. Its local government works under another unit of government.
- Population, 2020–2024 estimate
- 1,962 ± 249
- County
- Grundy County
- School district
- Gladbrook-Reinbeck Community School District
- Land area
- 36.2 sq mi (93.8 km²)
- Type
- TownshipGovernment under another
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $86,016 ± $9,960
- Median home value
- $171,200 ± $8,913
- Water area
- 0 sq mi (0.01 km²)
- State
- Iowa
- Census code (GEOID)
- 1907590249
- Coordinates (central point)
- 42.343146, -92.602292
These coordinates mark a central point for the area, not a street address. Population, income and home value: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 20, 2026.
Census place in Black Hawk Township
- Reinbeck (city)1,715 people
This place’s central point lies inside Black Hawk Township. A place can reach across the line, and its government, if it has one, can be separate from the township’s.
Bordering areas, nearest first
- Washington Township5.3 mi west
- Grant Township5.8 mi north
- Grant Township, Tama County6.7 mi south
- Lincoln Township, Black Hawk County6.7 mi east
These towns, townships, cities and boroughs share a boundary with Black Hawk Township. Distances are straight lines between central points, not driving distances.
Other townships in Grundy County, largest first
- Palermo Township3,038 people
- Grant Township1,829 people
- Clay Township1,559 people
- Shiloh Township954 people
- Beaver Township686 people
- Colfax Township618 people
- Fairfield Township505 people
- Washington Township272 people
- Pleasant Valley Township261 people
- Lincoln Township235 people
- Felix Township185 people
- German Township145 people
All 13
- Melrose Township135 people
People counts are American Community Survey 2020–2024 5-year estimates. See Grundy County for its cities, ZIP Code areas and county seat.
Sunrise and sunset in Black Hawk Township
- Longest day
- 15 hours 17 minutes around June 21
- Shortest day
- 9 hours 4 minutes around December 21
- Earliest sunrise
- 5:33 AM around June 15
- Latest sunrise
- 7:49 AM the day before clocks go back in November
- Earliest sunset
- 4:37 PM around December 9
- Latest sunset
- 8:51 PM around June 27
Clocks go forward an hour on the second Sunday in March and back on the first Sunday in November, so sunrise and sunset jump an hour later in March and an hour earlier in November.
| Day | Sunrise | Sunset | Daylight |
|---|---|---|---|
| Jan 15 | 7:36 AM | 5:03 PM | 9 h 27 min |
| Feb 15 | 7:07 AM | 5:42 PM | 10 h 35 min |
| Mar 15 | 7:22 AM | 7:16 PM | 11 h 54 min |
| Apr 15 | 6:29 AM | 7:51 PM | 13 h 22 min |
| May 15 | 5:49 AM | 8:25 PM | 14 h 36 min |
| Jun 15 | 5:33 AM | 8:48 PM | 15 h 15 min |
| Jul 15 | 5:46 AM | 8:45 PM | 14 h 59 min |
| Aug 15 | 6:17 AM | 8:11 PM | 13 h 54 min |
| Sep 15 | 6:50 AM | 7:20 PM | 12 h 30 min |
| Oct 15 | 7:23 AM | 6:28 PM | 11 h 5 min |
| Nov 15 | 7:00 AM | 4:48 PM | 9 h 48 min |
| Dec 15 | 7:32 AM | 4:38 PM | 9 h 6 min |
Approximate times for a flat horizon at the central point; the days move by a day or so from year to year. Hills and weather can change what you see.
Before using this answer on a form
A township line is not always the line on your mail: a mailing address can name another town or post office, and school districts, ZIP Codes and tax districts follow their own lines. For taxes, voting or permits, check the full address with Grundy County or the local office.
Find the township or town where you are now or find your county.