Irwin, Pennsylvania
Demographics
As of the census of 2000, there were 4,366 people, 2,084 households, and 1,131 families residing in the borough. The population density was 4,947.0 people per square mile (1,915.6/km²).

Irwin, Pennsylvania

Section Title: Demographics
Table Section Text: As of the census of 2000, there were 4,366 people, 2,084 households, and 1,131 families residing in the borough. The population density was 4,947.0 people per square mile (1,915.6/km²).

Historical population

Census	Pop.	%±

1820	405	—

1870	833	—

1880	1,444	73.3%

1890	2,428	68.1%

1900	2,452	1.0%

1910	2,886	17.7%

1920	3,235	12.1%

1930	3,443	6.4%

1940	3,441	−0.1%

1950	4,228	22.9%

1960	4,270	1.0%

1970	4,059	−4.9%

1980	4,995	23.1%

1990	4,604	−7.8%

2000	4,366	−5.2%

2010	3,973	−9.0%

Est. 2017	3,784	−4.8%

Sources:

Sentence(s)

In 1900, the population of Irwin numbered 2,452, and it increased to 2,886 in 1910.

final_sentence: In 1900, the population of Irwin numbered 2,452, and it increased to 2,886 in 1910.