City vs city
Castleford vs Twin Falls, Idaho
Twin Falls has about 246.0 times as many people as Castleford. They are about 21 miles apart in a straight line.
The basics
Population
Source: U.S. Census Bureau population estimates (Vintage 2024) · July 1, 2024 estimate
226
55,589
County
Source: U.S. Census Bureau and USGS Geographic Names Information System · Checked Oct 3, 2026
Twin Falls County
Twin Falls County
Elevation
Source: USGS Geographic Names Information System · Checked Oct 3, 2026
3,900 ft
3,700 ft
Distance to Boise (straight line)
Source: Straight line between the two town centers (USGS and Census coordinates) · Checked Oct 3, 2026
101 mi
114 mi
Price level (U.S. average = 100)
Source: U.S. Bureau of Economic Analysis regional price parities, all items, for the metro area (via FRED) · 2024 data, released Feb 19, 2026 · Towns outside a metro area use Idaho's statewide figure.
95.5
95.5
Public schools
Source: NCES Common Core of Data, operating public schools · 2024-25 school year
1
22
Work and getting around town
Local businesses listed
Source: Local businesses listed on Treasure Idaho · Updated Oct 1, 2026
1
20
Outdoors
Named parks in town
Source: Named parks on OpenStreetMap · Checked Oct 2, 2026
1
30
Trails within 15 miles
Source: Trails listed on Treasure Idaho (OpenStreetMap and public land agencies) · Checked Oct 2, 2026
2
34
Things to do within 15 miles
Source: Things to do listed on Treasure Idaho (OpenStreetMap and USGS) · Checked Oct 2, 2026
4
21
Allergies, in a typical year
Spring tree pollen
Source: National Allergy Bureau daily pollen counts, CDC release 2003 to 2024 (Boise, Twin Falls, Coeur d'Alene stations) · Typical year; how it is rated is on each city page
Moderate
Moderate
Early-summer grass pollen
Source: The Allergy Group (Boise) grass counts; NAB station reports for North Idaho · Typical year; how it is rated is on each city page
High
High
Fall weed and sagebrush pollen
Source: National Allergy Bureau daily pollen counts, CDC release 2003 to 2024 (Boise, Twin Falls, Coeur d'Alene stations) · Typical year; how it is rated is on each city page
High
High
Wildfire smoke (days a year over AQI 100)
Source: EPA AirData: annual AQI by county · 2021 to 2025 average
Moderate, 3.4
Moderate, 3.4
Only figures both towns have are shown. Counts of communities, builders, jobs, businesses and stays are what Treasure Idaho lists today, not every one in town. Allergy ratings are typical, general guidance, not medical advice; each city page shows how its ratings were worked out.