A share of 100 percent sounds definitive. In the Address District Older Home Index it usually is not. Of the 1,192 ZIP codes in the index, 459 show every home in the sample built in 1980 or earlier. In 310 of them, the sample is a single home.
Set the bar at eight homes and the list shrinks to six.
| ZIP | Place | State | Homes | Older homes | Older vs new | Rank |
|---|---|---|---|---|---|---|
| 48009 | BirminghamOakland County, MI | MI | 15 | 15 | 20.3% | 36 |
| 60091 | WilmetteCook County, IL | IL | 12 | 12 | 27.5% | 56 |
| 33161 | Biscayne ParkMiami-Dade County, FL | FL | 11 | 11 | 17.4% | 69 |
| 80220 | Hilltop / MontclairDenver, CO | CO | 9 | 9 | 22.4% | 96 |
| 33181 | North MiamiMiami-Dade County, FL | FL | 8 | 8 | 20.5% | 111 |
| 89451 | Incline VillageWashoe County, NV | NV | 8 | 8 | 12.6% | 111 |
Birmingham, Michigan, has the largest sample of the six, 15 homes, all older homes. It ranks 36th nationally and first in Michigan. Wilmette, on Chicago’s North Shore, follows with 12 of 12 and ranks first in Illinois. Biscayne Park, in Miami-Dade County, has 11 of 11. Hilltop and Montclair in Denver, North Miami and Incline Village on Lake Tahoe complete the list.
Close behind
Three more neighborhoods have seven of seven. Two are in North Carolina, Mooresville and Plaza Midwood in Charlotte. The third is South Tampa and Bayshore.
What the share leaves out
A full sample of older homes describes the homes sampled, not every home in the ZIP code. Prices tell more of the story. In Incline Village, older homes averaged 12.6 percent of the price of new construction. In Wilmette the figure is 27.5 percent.
The full list of neighborhoods at 100 percent, with their sample sizes, is in the Older Home Index, which can be filtered to larger samples. Owners in any of them can request an off-market offer.
Sources
- Address District, The Older Home Index, October 2026
- Address District, Older Home Index methodology, October 2026
