The Marion County portion of Idanha is part of the Salem Metropolitan Statistical Area, while the Linn County portion is part of the Albany–Lebanon Micropolitan Statistical Area.

[6][7] This region experiences warm and dry summers, with no average monthly temperatures above 71.6 °F (22.0 °C).

36.9% of all households were made up of individuals, and 12.3% had someone living alone who was 65 years of age or older.

16.5% of all households were made up of individuals, and 4.7% had someone living alone who was 65 years of age or older.

[4] Idanha is served by the Santiam Canyon School District.

Idanha saw rail service until the 1950s, when the track was removed for development of Detroit Lake, situated over the historical roadbed of the former Oregon Pacific Railroad.

The Lionshead Wildfire had ignited on August 16, 2020, within the nearby Willamette National Forest.

It continued burning in the wilderness area with limited intervention by firefighters due to the difficult terrain, slowly growing in size until September 7, 2020, when strong east winds reaching 50 miles per hour (80 km/h) drove the wildfire east through the canyon in which the town of Idanha and several others are located.

The Idanha-Detroit Rural Fire Protection District, which serves the cities of Idanha and Detroit, was pivotal in notifying sleeping residents of the evacuations and attempting to manage numerous small fires which had sprung up due to electrical lines coming down in the strong wind, with limited success.