Allegheny County (ALL)
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Wyoming
York
| Year |
Total stations |
Mobiles | Portables | Rovers |
% of grand total |
County total |
| 1987 | 12 | 2 | 0 | 0 | 1.50% | 165,782 |
| 1988 | 16 | 1 | 1 | 0 | 3.60% | 382,056 |
| 1989 | 16 | 0 | 0 | 0 | 3.21% | 315,744 |
| 1990 | 22 | 6 | 0 | 0 | 1.35% | 173,466 |
| 1991 | 12 | 3 | 0 | 0 | 0.92% | 106,966 |
| 1992 | 19 | 4 | 0 | 0 | 2.48% | 264,005 |
| 1993 | 13 | 1 | 1 | 0 | 2.33% | 235,786 |
| 1994 | 15 | 0 | 0 | 0 | 2.82% | 391,840 |
| 1995 | 14 | 0 | 0 | 0 | 2.63% | 377,487 |
| 1996 | 15 | 1 | 0 | 0 | 4.17% | 593,568 |
| 1997 | 16 | 2 | 0 | 0 | 3.64% | 508,208 |
| 1998 | 20 | 1 | 0 | 1 | 3.94% | 658,736 |
| 1999 | 20 | 3 | 0 | 1 | 4.17% | 620,170 |
| 2000 | 18 | 4 | 0 | 0 | 4.18% | 612,557 |
| 2001 | 23 | 5 | 0 | 0 | 4.85% | 754,512 |
| 2002 | 23 | 2 | 0 | 0 | 2.84% | 500,746 |
| 2003 | 17 | 3 | 0 | 0 | 5.62% | 788,162 |
| 2004 | 12 | 1 | 0 | 0 | 3.98% | 458,401 |
| 2005 | 9 | 0 | 0 | 0 | 3.76% | 483,910 |
| 2006 | 13 | 2 | 0 | 1 | 6.19% | 677,113 |
| 2007 | 12 | 1 | 0 | 1 | 3.12% | 323,545 |