These six sirens are in Grove City:
http://goo.gl/maps/vzCit - Model 2. City's system. Fire calls and severe weather.
http://goo.gl/maps/dGL7D - Model 2. City's system. Fire calls and severe weather.
http://goo.gl/maps/aduZj - Model 2. No street view. City's system. Fire calls and severe weather.
http://goo.gl/maps/8ai0h - Model 2. City's system. Fire calls and severe weather.
http://goo.gl/maps/yxRWn - Model 2. Obscured by a tree. City's system. Fire calls and severe weather.
http://goo.gl/maps/gBkvI - Modulator. College's own system. Severe weather only.
Other sirens of interest:
http://goo.gl/maps/iofNn - Slippery Rock's EOWS 115. Used to be used for fire calls, no longer works (hit by lightning several times, taking out the drivers.)
http://goo.gl/maps/ETRss - Harrisville's Model 7. Unknown if still used for fire calls.
http://goo.gl/maps/vXZWP - Hatboro's Model 5. I believe it's still used for fire calls.
http://goo.gl/maps/3AjsC - Bryn Athyn's STH-10. Used for fire calls.
http://goo.gl/maps/JFgIK - Pottsville's Mobil-Directo. Used for fire calls.
I also know of a Sentry 10V in Leeper, but I can't find it on street view.
Sorry if any of these have been posted already

~Noah