Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Region: CO

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
970-831 2 Brush CO DNVRCOSOFMD  624H ONVOY SPECTRUM, LLC 656   2021-11-07   
970-831 4 Brush CO   515J IP HORIZON LLC 656   2022-09-16   
970-831 6 Brush CO FTCLCOMAAMD  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656   2021-03-30   
970-831 8 Brush CO DNVRCOSOFMD  624H ONVOY SPECTRUM, LLC 656   2021-07-19   
970-831 9 Brush CO DNVRCOSOFMD  624H ONVOY SPECTRUM, LLC 656   2021-11-07   
970-832 A Carbondale CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656      
970-832 0 Carbondale CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2016-08-20   
970-832 1 Carbondale CO DNVRCO26XIX  073H TELNYX LLC 656   2017-06-09   
970-832 2 Carbondale CO DNVRCOII0MD  5562 METROPCS, INC. 656   2017-03-02   
970-832 3 Carbondale CO DNVRCO26DS5  278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2019-03-30   
970-832 5 Carbondale CO DNVRCOSOFMD  624H ONVOY SPECTRUM, LLC 656   2021-07-19   
970-832 6 Carbondale CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2020-10-30   
970-832 7 Carbondale CO DNVRCOII0MD  5562 METROPCS, INC. 656   2019-08-01   
970-832 8 Carbondale CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2018-12-30   
970-832 9 Carbondale CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2018-12-30   
970-833 A Windsor CO DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
970-833 0 Windsor CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2014-06-19   
970-833 1 Windsor CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2014-12-08   
970-833 2 Windsor CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2016-03-21   
970-833 3 Windsor CO DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2014-01-31   
970-833 4 Windsor CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2016-03-21   
970-833 5 Windsor CO DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2015-04-03   
970-833 6 Windsor CO DNVRCO26XIX  073H TELNYX LLC 656   2017-06-23   
970-833 7 Windsor CO HLRNCOFP1MD  508J CENTURYLINK COMMUNICATIONS, LLC 656   2015-05-26   
970-833 8 Windsor CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-06-11   
970-833 9 Windsor CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2014-11-24   
970-834 A Eaton CO AULTCOMARS1  9636 QWEST CORPORATION 656      
970-834 0 Eaton CO AULTCOMARS1  9636 QWEST CORPORATION 656      
970-834 1 Eaton CO AULTCOMARS1  9636 QWEST CORPORATION 656      
970-834 2 Eaton CO AULTCOMARS1  9636 QWEST CORPORATION 656      
970-834 3 Eaton CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2015-06-27   
970-834 4 Eaton CO DNVTCO56AMD  8465 GLOBAL CROSSING LOCAL SERVICES, INC. - CO 656   2011-01-03   
970-834 6 Eaton CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2006-02-05   
970-834 7 Eaton CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2022-11-25   
970-834 8 Eaton CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2012-08-18   
970-834 9 Eaton CO AULTCOMARS1  9636 QWEST CORPORATION 656      
970-835 A Eckert CO ECKRCOXCRP0  2184 DELTA COUNTY TELE-COMM, INC. 656      
970-835 0 Eckert CO ECKRCOXCRP0  2184 DELTA COUNTY TELE-COMM, INC. 656      
970-835 1 Eckert CO ECKRCOXCRP0  2184 DELTA COUNTY TELE-COMM, INC. 656      
970-835 2 Eckert CO ECKRCOXCRP0  2184 DELTA COUNTY TELE-COMM, INC. 656      
970-835 3 Eckert CO ECKRCOXCRP0  2184 DELTA COUNTY TELE-COMM, INC. 656      
970-835 4 Eckert CO ECKRCOXCRP0  2184 DELTA COUNTY TELE-COMM, INC. 656      
970-835 6 Eckert CO GDJTCOMAPMD  5972 INTERLINK ADV SVC DBA FORETHOUGHT.NET - CO 656   2016-11-05   
970-835 7 Eckert CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2022-09-30   
970-835 8 Eckert CO ECKRCOXCRP0  2184 DELTA COUNTY TELE-COMM, INC. 656      
970-835 9 Eckert CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2020-09-14   
970-836 A Greeley CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
970-836 0 Greeley CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2022-08-27   
970-836 1 Greeley CO DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2023-09-10   
970-836 2 Greeley CO DNVRCOII0MD  6529 T-MOBILE USA, INC. 656   2022-08-28   
970-836 3 Greeley CO DNVRCOII0MD  6529 T-MOBILE USA, INC. 656   2022-08-28   
970-836 4 Greeley CO DNVRCOII0MD  6529 T-MOBILE USA, INC. 656   2022-08-28   
970-836 5 Greeley CO DNVRCOII0MD  6529 T-MOBILE USA, INC. 656   2022-08-28   
970-836 6 Greeley CO DNVRCOII0MD  5562 METROPCS, INC. 656   2022-12-27   
970-836 7 Greeley CO DNVRCOMA51Z  839J EON TELECOM, INC. 656   2023-06-20   
970-836 8 Greeley CO DNVRCOII0MD  5562 METROPCS, INC. 656   2022-12-27   
970-836 9 Greeley CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2023-07-08   
970-837 A Fort Collins CO DNVRCO26XUX  516J TON80 COMMUNICATIONS, LLC 656      
970-837 0 Fort Collins CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2024-05-23   
970-837 1 Fort Collins CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2022-03-08   
970-837 2 Fort Collins CO DNVRCO26DMD  197D VONAGE AMERICA LLC 656   2021-10-28   
970-837 3 Fort Collins CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-05-09   
970-837 4 Fort Collins CO DNVRCO26XUX  516J TON80 COMMUNICATIONS, LLC 656   2020-11-23   
970-837 5 Fort Collins CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-05-09   
970-837 6 Fort Collins CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2022-03-08   
970-837 7 Fort Collins CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-05-09   
970-837 8 Fort Collins CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-05-09   
970-837 9 Fort Collins CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2022-11-27   
970-838 A Walden CO DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
970-838 0 Walden CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2023-05-19   
970-838 1 Walden CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2023-03-05   
970-838 3 Walden CO DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2019-05-13   
970-838 7 Walden CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2020-10-30   
970-839 A Silt CO AURSCOFW2MD  073H TELNYX LLC 656      
970-839 0 Silt CO AURSCOFW2MD  073H TELNYX LLC 656   2021-07-24   
970-839 1 Silt CO   515J IP HORIZON LLC 656   2022-09-16   
970-839 6 Silt CO FTCLCOMAAMD  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656   2022-08-08   
970-839 7 Silt CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2023-01-06   
970-839 8 Silt CO DNVRCO26XUX  516J TON80 COMMUNICATIONS, LLC 656   2021-10-21   
970-839 9 Silt CO DNVRCO26DS5  278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2021-12-25   
970-840 A Brush CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
970-840 0 Brush CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2006-03-23   
970-840 1 Brush CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2020-02-22   
970-840 2 Brush CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2011-01-14   
970-840 3 Brush CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2012-12-12   
970-840 4 Brush CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2012-12-12   
970-840 5 Brush CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2018-02-23   
970-840 6 Brush CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2013-04-04   
970-840 7 Brush CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2006-11-25   
970-840 8 Brush CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2012-05-21   
970-840 9 Brush CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2013-04-14   
970-841 A Craig CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656      
970-841 0 Craig CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2021-10-28   
970-841 1 Craig CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2022-02-07   
970-841 2 Craig CO DNVRCOII0MD  6529 T-MOBILE USA, INC. 656   2024-10-03   
970-841 5 Craig CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2023-12-30   
970-841 6 Craig CO DNVRCO26DS5  278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2023-09-08   
970-841 7 Craig CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2023-01-03   
970-841 8 Craig CO   515J IP HORIZON LLC 656   2022-04-29   
970-841 9 Craig CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2022-04-01   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 >>

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.