Williamsport is the larger principal city of the Williamsport-Lock Haven CSA, a Combined Statistical Area that includes the Williamsport metropolitan area (Lycoming County) and the Lock Haven micropolitan area (Clinton County), which had a combined population of 157,958 at the 2000 census.

As of the census of 2000, there were 30,706 people, 12,219 households, and 6,732 families residing in the city.
The population density was 3,456.3 people per square mile (1,335.1/km²).
There were 13,524 housing units at an average density of 1,522.3 per square mile (588.0/km²).
The racial makeup of the city was 84.1% White, 12.7% Black, 0.4% Native American, 0.6% Asian, 0.0% Pacific Islander, 0.5% from other races, and 1.7% from two or more races.
Hispanic or Latino of any race were 1.1% of the population.

There were 12,219 households, out of which 27.4% had children under the age of 18 living with them, 34.9% were married couples living together, 15.5% had a female householder with no husband present, and 44.9% were non-families.
35.1% of all households were made up of individuals, and 12.9% had someone living alone who was 65 years of age or older.
The average household size was 2.30 and the average family size was 2.97.

In the city the population was spread out, with 22.5% under the age of 18, 18.0% from 18 to 24, 26.7% from 25 to 44, 19.4% from 45 to 64, and 13.5% who were 65 years of age or older.
The median age was 32 years.
For every 100 females, there were 97.7 males.
For every 100 females age 18 and over, there were 95.9 males.

The median income for a household in the city was $25,946, and the median income for a family was $33,844.
Males had a median income of $26,668 versus $20,196 for females.
The per capita income for the city was $14,707.
About 13.7% of families and 21.5% of the population were below the poverty line, including 24.0% of those under age 18 and 11.6% of those age 65 or over.
Williamsport is the larger principal city of the Williamsport-Lock Haven CSA, a Combined Statistical Area that includes the Williamsport metropolitan area (Lycoming County) and the Lock Haven micropolitan area (Clinton County), which had a combined population of 157,958 at the 2000 census.
As of the census of 2000, there were 30,706 people, 12,219 households, and 6,732 families residing in the city. The population density was 3,456.3 people per square mile (1,335.1/km²). There were 13,524 housing units at an average density of 1,522.3 per square mile (588.0/km²). The racial makeup of the city was 84.1% White, 12.7% Black, 0.4% Native American, 0.6% Asian, 0.0% Pacific Islander, 0.5% from other races, and 1.7% from two or more races. Hispanic or Latino of any race were 1.1% of the population.
There were 12,219 households, out of which 27.4% had children under the age of 18 living with them, 34.9% were married couples living together, 15.5% had a female householder with no husband present, and 44.9% were non-families. 35.1% of all households were made up of individuals, and 12.9% had someone living alone who was 65 years of age or older. The average household size was 2.30 and the average family size was 2.97.
In the city the population was spread out, with 22.5% under the age of 18, 18.0% from 18 to 24, 26.7% from 25 to 44, 19.4% from 45 to 64, and 13.5% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 97.7 males. For every 100 females age 18 and over, there were 95.9 males.
The median income for a household in the city was $25,946, and the median income for a family was $33,844. Males had a median income of $26,668 versus $20,196 for females. The per capita income for the city was $14,707. About 13.7% of families and 21.5% of the population were below the poverty line, including 24.0% of those under age 18 and 11.6% of those age 65 or over.
Williamsport, Pennsylvania