PLATE NO. 104 DENSITY OF POPULATION OF PENNSYLVANIA, BY COUNTIES: 1910 … RURAL POPULATION NUMBER OF INHABITANTS PER SQUARE MILE J LESS than 2 "VJ 6 TO 18 E%j%d 45 TO 90 |~ 7\ 2 TO 0 KS?:1 18 TO 45 B99 90 AND OVFR •k NO RURAL POPULATION Rural population is defined as that residing outside of incorporated places having 2,500 inhabitants or more.
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