|St. Clair, Pennsylvania|
|— Borough —|
St. Clair, Pennsylvania
|- Type||Borough Council|
|- Total||1.2 sq mi (3.1 km2)|
|- Density||2,661.7/sq mi (1,027.7/km2)|
|Time zone||Eastern (EST) (UTC-5)|
|- Summer (DST)||EDT (UTC-4)|
St. Clair is a borough in Schuylkill County, Pennsylvania two miles (3 km) north of Pottsville or the southern Coal Region. Extensive deposits of hard coal are present. In the past, the manufacturing interests were the production of miners' squibs and fuses and miners' caps.
As of the census of 2000, there were 3,254 people, 1,497 households, and 887 families residing in the borough. The population density was 2,661.7 people per square mile (1,029.8/km²). There were 1,647 housing units at an average density of 1,347.2/sq mi (521.2/km²). The racial makeup of the borough was 98.71% White, 0.68% African American, 0.09% Native American, 0.06% Asian, 0.22% from other races, and 0.25% from two or more races. Hispanic or Latino of any race were 0.71% of the population.
There were 1,497 households out of which 20.2% had children under the age of 18 living with them, 41.1% were married couples living together, 12.5% had a female householder with no husband present, and 40.7% were non-families. 36.6% of all households were made up of individuals and 22.2% had someone living alone who was 65 years of age or older. The average household size was 2.17 and the average family size was 2.83.
In the borough the population was spread out with 18.6% under the age of 18, 6.4% from 18 to 24, 26.2% from 25 to 44, 22.7% from 45 to 64, and 26.1% who were 65 years of age or older. The median age was 44 years. For every 100 females there were 88.4 males. For every 100 females age 18 and over, there were 85.2 males.
The median income for a household in the borough was $28,161, and the median income for a family was $35,024. Males had a median income of $28,566 versus $20,719 for females. The per capita income for the borough was $15,418. About 7.7% of families and 11.8% of the population were below the poverty line, including 14.6% of those under age 18 and 9.9% of those age 65 or over.