Idaho Falls' decision frame starts with Zillow's typical city home value of $398,674 and typical observed monthly market rent of $1,383. Their direct relationship is a 4.2% gross yield before operating costs. The Zillow value is 5.45x ACS median household income; annual Zillow rent is 22.7% of that income. These are broad affordability screens, not a mortgage-payment test or proof of attainable property rent.
The city has 26,531 housing units; its citywide vacancy rate is 6.8%, and renters occupy 35.8% of occupied units. ACS reports a $335,500 median value for surveyed owner-occupied housing and $1,075 median gross rent for surveyed renter-occupied housing, including selected utilities. Those ACS measures cover occupied housing and differ in concept and period from Zillow's typical market value and observed rent; averaging them would misstate economics.
City depth is mixed. Among renting households with burden measured, 42.2% spend 30% or more of income on gross rent. Single-family structures are 70.1% of units, versus 5.2% in large multifamily structures. Of vacant units, 23.1% are for rent, while seasonal vacancies are the largest reported reason; neither identifies investable or immediately leasable units. Population rose 10.2% between overlapping ACS vintages, not an annualized change and possibly affected by boundaries. Median household income is $73,110, unemployment is 4.2%, and poverty is 11.5%. These constraints cannot explain rent performance or show that a rental will lease quickly.
At the county scope, Bonneville County has a 51-day median listing time and 21.2% price-reduced share, negotiating context that does not measure Idaho Falls alone. The broader Idaho Falls metro has 2.8 months of supply, price drops on 36.8% of listings, and a 0.15% year-over-year job decline. These metro measures indicate buyer options and slightly softer employment, not city pricing or tenant demand. The national 30-year mortgage rate is 6.66%, a financing benchmark rather than a local quote.
All city, county, metro, and national figures are aggregates; they omit property condition, attainable unit rent, concessions, tenant quality, turnover, and expense history. Gross yield excludes vacancy, repairs, management, insurance, property tax, owner-paid utilities, capital work, and financing. Before acting, verify leases, deposits, property-level rent and sale comparables, the tax bill, insurance and hazard coverage, utility responsibility, inspection findings, title, zoning, permits, and near-term capital needs; model cash flow from actual loan terms and conservative operating assumptions.