The median income of Allegan County residents was an inflation-adjusted $29,507 per year. Allegan County had 42,556 households in 2017, with a population of 114,145.
The county with the highest median resident income in the state was Oakland County. Oakland County's median income was $36,567 per year after adjusting for inflation – $7,060 more than Allegan County. It had 499,617 households in 2017 and a population of 1,241,860.
Isabella County had the lowest annual resident income among counties in Michigan, with a median income of only $17,211 per year. That was $12,296 less than the median income in Allegan County at the time. Isabella County had 24,898 households in 2017 and a population of 70,572.
The table below shows the state's counties ranked by median annual resident earnings in 2017.
| Rank | County | Earnings per resident ($$$) |
|---|---|---|
| 1 | Oakland County | 36,567 |
| 2 | Livingston County | 35,998 |
| 3 | Clinton County | 32,485 |
| 4 | Washtenaw County | 31,581 |
| 5 | Eaton County | 31,351 |
| 6 | Leelanau County | 29,948 |
| 7 | Macomb County | 29,886 |
| 8 | Allegan County | 29,507 |
| 9 | Monroe County | 29,427 |
| 10 | Barry County | 29,174 |
| 11 | Midland County | 28,384 |
| 12 | Grand Traverse County | 28,017 |
| 13 | Kent County | 27,747 |
| 14 | Ottawa County | 27,628 |
| 15 | Lapeer County | 27,443 |
| 16 | Charlevoix County | 26,983 |
| 17 | Emmet County | 26,821 |
| 18 | Ionia County | 26,554 |
| 19 | Shiawassee County | 26,553 |
| 20 | St. Clair County | 26,368 |
| 21 | Cass County | 26,276 |
| 22 | Lenawee County | 26,163 |
| 23 | Kalamazoo County | 25,927 |
| 24 | St. Joseph County | 25,841 |
| 25 | Jackson County | 25,590 |
| 26 | Bay County | 25,555 |
| 27 | Huron County | 25,442 |
| 28 | Branch County | 25,414 |
| 29 | Benzie County | 25,330 |
| 30 | Berrien County | 25,234 |
| 31 | Keweenaw County | 25,061 |
| 32 | Otsego County | 25,039 |
| 33 | Antrim County | 25,007 |
| 34 | Genesee County | 24,898 |
| 35 | Dickinson County | 24,892 |
| 36 | Van Buren County | 24,873 |
| 37 | Calhoun County | 24,465 |
| 38 | Hillsdale County | 24,418 |
| 39 | Wayne County | 24,392 |
| 40 | Baraga County | 24,268 |
| 41 | Mackinac County | 24,263 |
| 42 | Menominee County | 24,189 |
| 43 | Saginaw County | 23,949 |
| 44 | Delta County | 23,823 |
| 45 | Tuscola County | 23,695 |
| 46 | Muskegon County | 23,652 |
| 47 | Ingham County | 23,651 |
| 48 | Mason County | 23,602 |
| 49 | Kalkaska County | 23,405 |
| 50 | Gratiot County | 23,383 |
| 51 | Manistee County | 23,283 |
| 52 | Sanilac County | 23,260 |
| 53 | Alpena County | 23,151 |
| 54 | Marquette County | 23,012 |
| 55 | Cheboygan County | 22,903 |
| 56 | Presque Isle County | 22,844 |
| 57 | Montcalm County | 22,800 |
| 58 | Wexford County | 22,705 |
| 59 | Missaukee County | 22,647 |
| 60 | Alger County | 22,604 |
| 61 | Gladwin County | 22,580 |
| 62 | Arenac County | 22,562 |
| 63 | Newaygo County | 22,476 |
| 64 | Iron County | 22,363 |
| 65 | Alcona County | 22,284 |
| 66 | Iosco County | 22,103 |
| 67 | Crawford County | 22,016 |
| 68 | Oceana County | 21,943 |
| 69 | Osceola County | 21,678 |
| 70 | Ontonagon County | 21,611 |
| 71 | Chippewa County | 21,593 |
| 72 | Oscoda County | 21,443 |
| 73 | Ogemaw County | 21,200 |
| 74 | Montmorency County | 20,772 |
| 75 | Roscommon County | 20,243 |
| 76 | Gogebic County | 20,165 |
| 77 | Clare County | 19,927 |
| 78 | Schoolcraft County | 19,794 |
| 79 | Mecosta County | 19,568 |
| 80 | Houghton County | 19,565 |
| 81 | Luce County | 19,418 |
| 82 | Lake County | 17,442 |
| 83 | Isabella County | 17,211 |
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