|• Total||0.3 sq mi (0.7 km2)|
|• Land||0.3 sq mi (0.7 km2)|
|• Water||0.0 sq mi (0.0 km2)|
|Elevation||653 ft (199 m)|
|• Density||530/sq mi (204.8/km2)|
|Time zone||UTC-5 (Eastern (EST))|
|• Summer (DST)||UTC-4 (EDT)|
|GNIS feature ID||1177825|
A milling business was set up in Iola in the winter of 1828. A church was built in the community in 1850.
Iola is located in northwestern Columbia County at  along the western edge of Greenwood Township. Iola is bordered to the south by the borough of Millville and to the west by Little Fishing Creek, across which is Pine Township. According to the United States Census Bureau, the CDP has a total area of 0.3 square miles (0.7 km2), all of it land.(41.132269, -76.533969),
Pennsylvania Route 42 runs north–south through the center of town, and Pennsylvania Route 442 branches to the northwest at the north end of town. The CDP is mostly flat with some rolling hills in the eastern section. Much of Iola, especially in the northwest and southeast, is farmland.
As of the census of 2000, there were 129 people, 59 households, and 34 families residing in the CDP. The population density was 484.1 people per square mile (184.5/km2). There were 66 housing units at an average density of 247.7/sq mi (94.4/km2). The racial makeup of the CDP was 99.22% White and 0.78% Asian.
There were 59 households, out of which 25.4% had children under the age of 18 living with them, 47.5% were married couples living together, 6.8% had a female householder with no husband present, and 40.7% were non-families. 35.6% of all households were made up of individuals, and 10.2% had someone living alone who was 65 years of age or older. The average household size was 2.19 and the average family size was 2.80.
In the CDP, the population was spread out, with 21.7% under the age of 18, 6.2% from 18 to 24, 31.8% from 25 to 44, 24.8% from 45 to 64, and 15.5% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 81.7 males. For every 100 females age 18 and over, there were 83.6 males.
The median income for a household in the CDP was $28,125, and the median income for a family was $36,563. Males had a median income of $28,125 versus $25,938 for females. The per capita income for the CDP was $16,211. There were 8.6% of families and 7.0% of the population living below the poverty line, including no under eighteens and 21.4% of those over 64.
- "Iola, Pennsylvania (PA 17846) profile: Population, maps, real estate, averages, homes, statistics, relocation, travel, jobs, hospitals, schools, crime, moving, houses, news, sex offenders".
- "Geographic Identifiers: 2010 Census Summary File 1 (G001): Iola CDP, Pennsylvania". U.S. Census Bureau, American Factfinder. Archived from the original on February 13, 2020. Retrieved May 28, 2015.
- "Chapter XII, Greenwood and Jackson Townships, History of Columbia and Montour Counties, Pennsylvania".
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "U.S. Census website". United States Census Bureau. Retrieved 2008-01-31.