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.

OCN: 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC

<< 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 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
240-243 A Gaithersburg MD WASKDCFNPS0  236      
240-243 0 Gaithersburg MD WASKDCFNPS0  236      
240-243 1 Gaithersburg MD WASKDCFNPS0  236      
240-243 2 Gaithersburg MD WASKDCFNPS0  236      
240-243 4 Gaithersburg MD WASKDCFNPS0  236      
240-243 9 Gaithersburg MD WASKDCFNPS0  236      
240-247 A Washington Zone 3 MD WASKDCFNPS0  236      
240-247 0 Washington Zone 3 MD WASKDCFNPS0  236      
240-247 1 Washington Zone 3 MD WASKDCFNPS0  236      
240-247 2 Washington Zone 3 MD WASKDCFNPS0  236      
240-247 4 Washington Zone 3 MD WASKDCFNPS0  236      
240-247 5 Washington Zone 3 MD WASKDCFNPS0  236      
240-247 6 Washington Zone 3 MD WASKDCFNPS0  236      
240-247 8 Washington Zone 3 MD WASKDCFNPS0  236      
240-247 9 Washington Zone 3 MD WASKDCFNPS0  236      
240-254 0 Hughesville MD WASKDCFNPS0  236   2005-08-15   
240-254 3 Hughesville MD WASKDCFNPS0  236   2005-08-15   
240-256 8 Leonardtown MD WASKDCFNPS0  236   2005-08-15   
240-260 A Washington Zone 14 MD WASKDCFNPS0  236      
240-260 0 Washington Zone 14 MD WASKDCFNPS0  236      
240-260 1 Washington Zone 14 MD WASKDCFNPS0  236      
240-260 2 Washington Zone 14 MD WASKDCFNPS0  236      
240-260 4 Washington Zone 14 MD WASKDCFNPS0  236      
240-264 2 Laurel MD WASHDCINDS0  236      
240-264 4 Laurel MD WASHDCINDS0  236      
240-264 5 Laurel MD WASKDCFNPS0  236   2006-10-27   
240-268 A Washington Zone 10 MD WASKDCFNPS0  236      
240-268 0 Washington Zone 10 MD WASKDCFNPS0  236      
240-268 1 Washington Zone 10 MD WASKDCFNPS0  236      
240-268 2 Washington Zone 10 MD WASKDCFNPS0  236      
240-268 3 Washington Zone 10 MD WASKDCFNPS0  236      
240-268 5 Washington Zone 10 MD WASKDCFNPS0  236      
240-268 6 Washington Zone 10 MD WASKDCFNPS0  236      
240-268 7 Washington Zone 10 MD WASKDCFNPS0  236      
240-268 8 Washington Zone 10 MD WASKDCFNPS0  236      
240-280 0 Laurel MD WASKDCFNPS0  236   2004-09-15   
240-280 3 Laurel MD WASKDCFNPS0  236   2008-10-01   
240-290 A Washington Zone 11 MD WASKDCFNPS0  236      
240-290 0 Washington Zone 11 MD WASKDCFNPS0  236      
240-290 1 Washington Zone 11 MD WASKDCFNPS0  236      
240-290 2 Washington Zone 11 MD WASKDCFNPS0  236      
240-290 3 Washington Zone 11 MD WASKDCFNPS0  236      
240-290 9 Washington Zone 11 MD WASKDCFNPS0  236      
240-292 7 Washington Zone 11 MD WASKDCFNPS0  236   2007-07-29   
240-293 1 Washington Zone 12 MD WASKDCFNPS0  236   2002-07-08   
240-294 A Laurel MD WASKDCFNPS0  236      
240-294 0 Laurel MD WASKDCFNPS0  236      
240-306 A Gaithersburg MD WASKDCFNPS0  236      
240-306 0 Gaithersburg MD WASKDCFNPS0  236      
240-306 1 Gaithersburg MD WASKDCFNPS0  236      
240-306 2 Gaithersburg MD WASKDCFNPS0  236      
240-306 3 Gaithersburg MD WASKDCFNPS0  236      
240-306 9 Gaithersburg MD WASKDCFNPS0  236      
240-308 7 Damascus MD WASHDCINDS0  236   2007-05-15   
240-316 3 Washington Zone 2 MD WASKDCFNPS0  236   2009-07-31   
240-317 6 Lexington Park-Great Mills MD WASKDCFNPS0  236   2007-02-19   
240-319 7 Laurel (Baltimore LATA) MD BLTMMDCHXNX  238   2010-08-22   
240-342 5 Ashton MD WASKDCFNPS0  236   2008-10-01   
240-349 3 La Plata MD WASKDCFNPS0  236   2005-08-15   
240-383 1 Washington Zone 2 MD WASKDCFNPS0  236   2007-07-22   
240-383 3 Washington Zone 2 MD WASKDCFNPS0  236   2007-07-22   
240-387 6 Washington Zone 13 MD WASKDCFNPS0  236   2007-02-22   
240-387 7 Washington Zone 13 MD WASKDCFNPS0  236   2007-02-22   
240-390 2 Ashton MD BLTMMDCHXNX  236   2006-08-12   
240-399 A Washington Zone 10 MD WASKDCFNPS0  236      
240-402 A Washington Zone 13 MD WASKDCFNPS0  236      
240-402 0 Washington Zone 13 MD WASKDCFNPS0  236   2010-11-13   
240-402 1 Washington Zone 13 MD WASKDCFNPS0  236   2010-11-13   
240-402 2 Washington Zone 13 MD WASKDCFNPS0  236   2010-11-13   
240-402 3 Washington Zone 13 MD WASKDCFNPS0  236   2010-11-13   
240-402 4 Washington Zone 13 MD WASKDCFNPS0  236   2010-11-13   
240-402 5 Washington Zone 13 MD WASKDCFNPS0  236   2010-11-13   
240-402 6 Washington Zone 13 MD WASKDCFNPS0  236   2010-11-13   
240-402 7 Washington Zone 13 MD WASKDCFNPS0  236   2010-11-13   
240-402 8 Washington Zone 13 MD WASKDCFNPS0  236   2010-11-13   
240-402 9 Washington Zone 13 MD WASKDCFNPS0  236   2010-11-13   
240-404 A Gaithersburg MD WASKDCFNPS0  236      
240-404 0 Gaithersburg MD WASKDCFNPS0  236      
240-404 6 Gaithersburg MD WASKDCFNPS0  236   2005-08-15   
240-404 7 Gaithersburg MD WASKDCFNPS0  236   2005-08-15   
240-404 9 Gaithersburg MD WASKDCFNPS0  236      
240-408 7 Washington Zone 10 MD WASKDCFNPS0  236   2011-03-15   
240-427 A Waldorf MD WASKDCFNPS0  236      
240-427 3 Waldorf MD WASKDCFNPS0  236   2005-05-11   
240-427 4 Waldorf MD WASKDCFNPS0  236   2005-05-11   
240-427 9 Waldorf MD WASKDCFNPS0  236      
240-437 A Ashton MD WASKDCFNPS0  236      
240-437 0 Ashton MD WASKDCFNPS0  236      
240-437 5 Ashton MD WASKDCFNPS0  236      
240-448 2 Waldorf MD WASKDCFNPS0  236   2014-11-17   
240-454 8 Gaithersburg MD WASKDCFNPS0  236   2006-08-12   
240-454 9 Gaithersburg MD WASKDCFNPS0  236   2006-08-12   
240-459 6 Laurel MD WASKDCFNPS0  236   2011-04-01   
240-489 A Poolesville MD WASKDCFNPS0  236      
240-489 0 Poolesville MD WASKDCFNPS0  236      
240-489 4 Poolesville MD WASKDCFNPS0  236   2005-08-15   
240-489 5 Poolesville MD WASKDCFNPS0  236   2005-08-15   
240-489 8 Poolesville MD WASKDCFNPS0  236   2005-08-15   
240-489 9 Poolesville MD WASKDCFNPS0  236      
240-510 A Washington Zone 15 MD WASKDCFNPS0  236      

<< 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 >>

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.