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In the 1930 United States census, Michigan was recorded as having a population of 4,842,325, ranking as the seventh most populous state in the country. By 1940, Michigan's population had increased by 8.5% to 5,256,106.
The following is a list of cities in Michigan with a population of at least 20,000 based on 1930 U.S. Census data. Historic census data from 1920 and 1940 is included to reflect trends in population increases or decreases. Cities that are part of the Detroit metropolitan area are shaded in tan.
| 1930 Rank |
City | County | 1920 Pop. | 1930 Pop. | 1940 Pop. | Change 1930-40 |
|---|---|---|---|---|---|---|
| 1 | Detroit | Wayne | 993,678 | 1,568,662 | 1,623,452 | 3.5% |
| 2 | Grand Rapids | Kent | 137,634 | 168,592 | 164,292 | −2.6% |
| 3 | Flint | Genesee | 91,599 | 156,492 | 151,543 | −3.2% |
| 4 | Saginaw | Saginaw | 61,903 | 80,715 | 82,794 | 2.6% |
| 5 | Lansing | Ingham | 57,327 | 78,397 | 78,753 | 0.5% |
| 6 | Pontiac | Oakland | 34,273 | 64,928 | 66,626 | 2.6% |
| 7 | Hamtramck | Wayne | 48,615 | 56,268 | 49,839 | −11.4% |
| 8 | Jackson | Jackson | 48,374 | 55,187 | 49,656 | −10.0% |
| 9 | Kalamazoo | Kalamazoo | 48,487 | 54,786 | 54,097 | −1.3% |
| 10 | Highland Park | Wayne | 46,499 | 52,959 | 50,810 | −4.1% |
| 11 | Dearborn | Wayne | 2,470 | 50,358 | 63,589 | 26.3% |
| 12 | Bay City | Bay | 47,554 | 47,355 | 47,956 | 1.3% |
| 13 | Battle Creek | Calhoun | 36,164 | 45,573 | 43,453 | −4.7% |
| 14 | Muskegon | Muskegon | 36,570 | 41,390 | 47,697 | 15.2% |
| 15 | Port Huron | St. Clair | 25,944 | 31,361 | 32,759 | 4.5% |
| 16 | Wyandotte | Wayne | 13,851 | 28,368 | 30,618 | 7.9% |
| 17 | Ann Arbor | Washtenaw | 19,516 | 26,944 | 29,815 | 10.7% |
| 18 | Royal Oak | Oakland | 6,007 | 22,904 | 25,087 | 9.5% |
| 19 | Ferndale | Oakland | 2,640 | 20,855 | 22,523 | 8.0% |
The following is a list of counties in Michigan with populations of at least 50,000 based on 1930 U.S. Census data. Historic census data from 1920 and 1940 are included to reflect trends in population increases or decreases.
| 1930 Rank |
County | Largest city | 1920 Pop. | 1930 Pop. | 1940 Pop. | Change 1930-40 |
|---|---|---|---|---|---|---|
| 1 | Wayne | Detroit | 1,177,645 | 1,888,946 | 2,015,623 | 6.7% |
| 2 | Kent | Grand Rapids | 183,041 | 240,511 | 246,338 | 2.4% |
| 3 | Genesee | Flint | 125,668 | 211,641 | 227,944 | 7.7% |
| 4 | Oakland | Pontiac | 90,050 | 211,251 | 254,068 | 20.3% |
| 5 | Saginaw | Saginaw | 100,286 | 120,717 | 130,468 | 8.1% |
| 6 | Ingham | Lansing | 81,554 | 116,587 | 130,616 | 12.0% |
| 7 | Jackson | Jackson | 72,539 | 92,304 | 93,108 | 0.9% |
| 8 | Kalamazoo | Kalamazoo | 71,225 | 91,368 | 100,085 | 9.5% |
| 9 | Calhoun | Battle Creek | 72,918 | 87,043 | 94,206 | 8.2% |
| 10 | Muskegon | Muskegon | 62,362 | 84,630 | 94,501 | 11.7% |
| 11 | Berrien | Benton Harbor | 62,653 | 81,066 | 89,117 | 9.9% |
| 12 | Macomb | Warren | 38,103 | 77,146 | 107,638 | 39.5% |
| 13 | Bay | Bay City | 69,548 | 69,474 | 74,981 | 7.9% |
| 14 | St. Clair | Port Huron | 58,009 | 67,563 | 76,222 | 12.8% |
| 15 | Washtenaw | Ann Arbor | 49,520 | 65,530 | 80,810 | 23.3% |
| 16 | Ottawa | Holland | 47,660 | 54,858 | 59,660 | 8.8% |
| 17 | Houghton | Houghton | 71,930 | 52,851 | 47,631 | −9.9% |
| 18 | Monroe | Monroe | 37,115 | 52,485 | 58,620 | 11.7% |
| 19 | Lenawee | Adrian | 47,767 | 49,849 | 53,110 | 6.5% |
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