Knoxville, TN · Tennessee
Union County
ZIP 37866
20,141 residents125 permits TTM$61,858 median HHI3 ZIP codesUpdated April 16, 2026
Investor first look
Median home value
$186,300
ACS 5-Year
Cap rate proxy
9.5%
FMR × 0.65 ÷ Home Value
Rent-to-income
16.5%
HUD FMR ÷ ACS HHI
Net migration
+2.00%
IRS SOI
Permits (TTM)
125
Census BPS
Climate risk
12.9
FEMA NRI (0–100)
ZIP 37866
Median home value
$392,449
Gross yield
3.1%
Cap rate
2.6%
Rent gap
16.8%
Affordability
P/I: 6.3R/I: —
Section 8 detail
SAFMR: $1,020Rent: $849Gap: 20.1%
ZIP code breakdown3 ZIP codes
| ZIP | Median home value | Rent (FMR 2BR) | Gross yield | Cap rate ↓ | Rent gap |
|---|---|---|---|---|---|
| 37779 | $225,114 | $1,090 | 5.8% | 4.5% | 22.1% |
| 37807 | $279,781 | $1,180 | 5.1% | 3.6% | 28.1% |
| 37866 | $392,449 | $1,020 | 3.1% | 2.6% | 16.8% |
Sort by any column. Click a ZIP for detail. Rent gap: green = HUD FMR above market rent.
Demographics
Owner-occupied
80.4%
Census ACS
Vacancy rate
20.0%
Census ACS
Bachelor's degree +
14.5%
Census ACS
Rent burdened
25.4%
Census ACS (>30% income)
Median age
42.4
Census ACS
U.S. Census Bureau — American Community Survey 5-Year Estimates
U.S. Census Bureau — Building Permits Survey
U.S. Department of Housing and Urban Development — Fair Market Rents / Small Area Fair Market Rents (SAFMR)
Internal Revenue Service — Statistics of Income Migration Data
FEMA — National Risk Index
Last updated: April 16, 2026