Each edition grades its towns against each other only.
Today 29 people live in this town, first settled in 1897.
Spencer’s midpoint age is 66.3 years, above both the Idaho town median (35.1 years) and the median of U.S. towns (40.5 years). No town among the 60 in Idaho we compare has a higher share of homes lived in by their owners than Spencer. Camas Meadow Camp and Battle Sites and Spencer Rock House is on the National Register of Historic Places. Spencer has fewer than 1,000 residents, too few for fair grades; the figures below are still real.
In a town this size, neighbors are the best guide. Ask them anything.
Census counts: 70 in 1950, a low of 11 in 1990, 31 in 2020. The archive holds 12 old photos and papers going back to 2004 and 2 maps from 1972 on.
1 place on the National Register of Historic Places.
Who provides power, water and the rest in Spencer, and how to reach them.
EPA SDWIS (Oct 9, 2026) · HIFLD + EIA-861 2025 · Census 2020 ZCTAs · NCES 2024–25 · registration: vote.gov, updated Sep 12, 2025.
Ordered by what stands out in Spencer.
Spencer’s FEMA hazard score comes in at 83 of 100. Of the losses FEMA expects in the town, 35% come from inland flooding and 32% from avalanches.
FEMA National Risk Index · OpenFEMA
Only 2 of the 60 Idaho towns we compare have a lower July high than Spencer. July afternoons reach 82° and January nights drop to 10°.
NOAA U.S. Climate Normals, 1991–2020
None within 15 miles of Spencer; the nearest are
About 5 of every 100 Spencer residents are enrolled in college, about the same as Idaho.
City in Idaho, United States
Spencer is an incorporated hamlet in Clark County, Idaho, United States. It serves as the base for the state's opal mine and is called the "Opal Capital of America": the mine proper is located 5–6 miles outside of town. The population was 31 at the 2020 census.
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Short answers, built from the data on this page.
Spencer has fewer than 1,000 residents, too few for fair grades; the figures below are still real.