Wireless 9-1-1 Accuracy Exclusions

Visit the original Google Documents file for other states and links to the filings for these exceptions.
Thanks to Daryl Branson, MPA ENP - Colorado 9-1-1 Resource Center, for compiling this information. 
Reasons for exception are included at the bottom of this list
County Carrier Reason for Exclusion
Barbour
Bibb
Blount
Blount
Bullock
Butler
Calhoun
Chambers
Cherokee
Chilton
Choctaw
Clay
Cleburne
Coffee
Covington
Crenshaw
DeKalb
DeKalb
Fayette
Franklin
Geneva
Greene
Jackson
Jackson
Lawrence
Marengo
Marshall
Perry
Pike
Randolph
Sumter
Sumter
T-Mobile
T-Mobile
AT&T Wireless
T-Mobile
T-Mobile
T-Mobile
Corr Wireless
T-Mobile
Corr Wireless
T-Mobile
T-Mobile
T-Mobile
T-Mobile
T-Mobile
T-Mobile
T-Mobile
T-Mobile
Corr Wireless
T-Mobile
T-Mobile
T-Mobile
T-Mobile
T-Mobile
Corr Wireless
Corr Wireless
T-Mobile
T-Mobile
T-Mobile
T-Mobile
T-Mobile
T-Mobile
CellSouth
Partial - west of Hwy 1/Hwy 431 coverage corridor
Partial - All except the area north of Hwy 6 and west of Hwy 5
Terrain exclusion - terrain too rough for triangulation
Entire county
Entire county
Entire county
Insufficient number of cell sites for triangulation.
Partial - north of the intersection of Hwy 1 and CR 50.
Insufficient number of cell sites for triangulation.
Partial - west of Hwy 31 coverage corridor
Entire county
Entire county
Entire county
Entire county
Partial - West of Hwy 84 and Hwy 15/Hwy 29
Entire county
Entire county
Insufficient number of cell sites for triangulation.
Entire county
all except a 5 mile radius from intersecton of Hwy 43 and Hwy 24
Partial - west of Hwy 167
Entire county
Partial - all except the Hwy 72 coverage corridor
Insufficient number of cell sites for triangulation.
Insufficient number of cell sites for triangulation.
Partial - south of the intersection of Hwy 43 and County Hwy 54
Partial - north of the intersection of Hwy 431 and Hwy 79
Entire county
Partial - All except Hwy 231 coverage corridor
Entire county
Entire county
Heavy forestaton
 
Under the current FCC rules, wireless providers are allowed to exclude a certain percentage of counties from their wireless Phase II accuracy calculations. They can do this for several different reasons:
  • If Carriers use a handheld-based solution (GPS triangulation), they can exclude counties for heavy forestation that may interfere with GPS signals. Up to 15% of the counties served by the carrier can be excluded for this reason.
  • If Carriers use a the network-based solution (cell tower triangulation), they can exclude counties where they have an insufficient number of cell sites, terrain makes triangulation difficult, where they have stand-alone sites, or where they have a "string of pearls", meaning a set of cell sites in a line along a road or highway, making triangulation impossible. Up to 40% of the counties served by the carrier can be excluded for these reasons.
 

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