| HOUSING | Sun Prairie | Lake Mills | United States |
| Median Home Age | 20 | 35.8 | 35.1 |
| Median Home Cost | $189,100 | $164,100 | $153,800 |
| Home Appreciation | -0.43% | -0.63% | 1.62% |
| Homes Owned | 58.08% | 55.76% | 57.69% |
| Housing Vacant | 6.26% | 16.46% | 11.38% |
| Homes Rented | 35.66% | 27.77% | 30.93% |
| Property Tax Rate | $21.40 | $19.04 | $11.20 |
| OWNER-OCCUPIED HOUSING UNITS BY VALUE | | | |
| Less Than $20,000 | 0.13% | 0.51% | 2.72% |
| $20,000 to $39,999 | 0.23% | 5.01% | 4.03% |
| $40,000 to $59,999 | 0.30% | 0.95% | 5.58% |
| $60,000 to $79,999 | 0.40% | 2.35% | 7.09% |
| $80,000 to $99,999 | 2.06% | 2.16% | 8.80% |
| $100,000 to $149,999 | 16.67% | 28.43% | 21.26% |
| $150,000 to $199,999 | 33.20% | 40.80% | 14.87% |
| $200,000 to $299,999 | 35.30% | 13.71% | 16.82% |
| $300,000 to $399,999 | 9.93% | 4.31% | 7.83% |
| $400,000 to $499,999 | 1.43% | 1.02% | 4.04% |
| $500,000 to $749,999 | 0.28% | 0.51% | 4.05% |
| $750,000 to $999,999 | 0.00% | 0.13% | 1.26% |
| $1,000,000 or more | 0.05% | 0.13% | 1.64% |
| HOUSING UNITS BY YEAR STRUCTURE BUILT | | | |
| 1999 to 2005 | 30.42% | 20.96% | 13.71% |
| 1995 to 1998 | 20.54% | 17.43% | 14.31% |
| 1990 to 1994 | 20.54% | 17.43% | 14.31% |
| 1980 to 1989 | 10.43% | 5.26% | 13.87% |
| 1970 to 1979 | 15.81% | 9.89% | 16.17% |
| 1960 to 1969 | 11.84% | 6.75% | 11.70% |
| 1950 to 1959 | 5.75% | 12.44% | 11.08% |
| 1940 to 1949 | 1.53% | 2.98% | 6.02% |
| 1939 or Earlier | 3.69% | 24.29% | 13.15% |
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