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.

NPA: 240 [Rate centres in NPA 240] [Dial plan for NPA 240]

<< 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 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-448 2 Waldorf MD WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2014-11-17   
240-448 3 Waldorf MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2014-05-10   
240-448 4 Waldorf MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-08-05   
240-448 5 Waldorf MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2015-10-20   
240-448 6 Waldorf MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-03-11   
240-448 7 Waldorf MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-03-11   
240-448 8 Waldorf MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-10-07   
240-448 9 Waldorf MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-10-20   
240-449 A Gaithersburg MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
240-449 0 Gaithersburg MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2003-11-24   
240-449 1 Gaithersburg MD   829J PAETEC ITEL, LLC 236   2005-09-03   
240-449 2 Gaithersburg MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2003-04-23   
240-449 3 Gaithersburg MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-05-07   
240-449 4 Gaithersburg MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-07   
240-449 5 Gaithersburg MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-03-24   
240-449 6 Gaithersburg MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-03-24   
240-449 7 Gaithersburg MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-03-24   
240-449 8 Gaithersburg MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-05-07   
240-449 9 Gaithersburg MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
240-450 A Washington Zone 3 MD   829J PAETEC ITEL, LLC 236   2025-04-02   
240-450 0 Washington Zone 3 MD   829J PAETEC ITEL, LLC 236      
240-450 1 Washington Zone 3 MD   829J PAETEC ITEL, LLC 236      
240-450 2 Washington Zone 3 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-04-03   
240-450 3 Washington Zone 3 MD   829J PAETEC ITEL, LLC 236      
240-450 4 Washington Zone 3 MD   829J PAETEC ITEL, LLC 236      
240-450 5 Washington Zone 3 MD   829J PAETEC ITEL, LLC 236      
240-450 6 Washington Zone 3 MD   829J PAETEC ITEL, LLC 236      
240-450 7 Washington Zone 3 MD WASHDC125MD  197D VONAGE AMERICA LLC 236   2020-05-20   
240-450 8 Washington Zone 3 MD WASHDC125MD  197D VONAGE AMERICA LLC 236   2020-05-20   
240-450 9 Washington Zone 3 MD   829J PAETEC ITEL, LLC 236      
240-451 A Thurmont MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240      
240-451 0 Thurmont MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2017-07-31   
240-451 1 Thurmont MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2017-07-31   
240-451 2 Thurmont MD FRDRMDFRX7X  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 240   2018-07-12   
240-451 3 Thurmont MD   2593 CORE COMMUNICATIONS, INC.- MD 240   2018-06-17   
240-451 4 Thurmont MD   2593 CORE COMMUNICATIONS, INC.- MD 240   2018-06-17   
240-451 5 Thurmont MD   2593 CORE COMMUNICATIONS, INC.- MD 240   2018-06-17   
240-451 6 Thurmont MD HGTWMD530MD  073H TELNYX LLC 240   2017-08-08   
240-451 7 Thurmont MD FRDRMDFRXKX  508J CENTURYLINK COMMUNICATIONS, LLC 240   2016-10-28   
240-451 8 Thurmont MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2016-10-02   
240-451 9 Thurmont MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2016-10-02   
240-452 A Hagerstown MD   5562 METROPCS, INC. 240      
240-452 0 Hagerstown MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2011-06-02   
240-452 1 Hagerstown MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2011-06-02   
240-452 2 Hagerstown MD FRDRMDFRKMD  5562 METROPCS, INC. 240   2011-04-28   
240-452 3 Hagerstown MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 240   2010-09-12   
240-452 4 Hagerstown MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240   2011-01-07   
240-452 5 Hagerstown MD FRDRMDFRKMD  5562 METROPCS, INC. 240   2011-04-28   
240-452 6 Hagerstown MD FRDRMDFRKMD  5562 METROPCS, INC. 240   2011-04-28   
240-452 7 Hagerstown MD FRDRMDFRKMD  5562 METROPCS, INC. 240   2011-04-28   

<< 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 >>

Last updated: Sat, 02 May 2026 12:20:53 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.