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Area Code 202
Image:Area code 202.svg, 350px, The red area is the District of Columbia, served by area codes 202 and 771. poly 0 50 49 54 103 84 111 88 101 107 118 130 143 139 179 140 211 188 238 203 260 240 259 248 248 250 255 262 253 357 1 357 Area codes 571 and 703 poly 1 1 0 45 52 48 117 84 109 109 121 127 180 136 199 164 254 112 345 204 264 286 258 358 420 358 420 1 Area codes 301, 240, and 227 desc bottom-left Area codes 202 and 771 are telephone area codes in the North American Numbering Plan (NANP) for Washington, D.C. Area code 202 was one of the original North American area codes established in October 1947 by the American Telephone and Telegraph Company (AT&T). After the State of New Jersey with area code 201, the District of Columbia was the second numbering plan area (NPA). Area code 771 was added to the numbering plan area in April 2021 in creation of an overlay complex to mitigate impending telephone number shortages. History Since the creation of the first nat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
District Of Columbia
Washington, D.C., formally the District of Columbia and commonly known as Washington or D.C., is the capital city and Federal district of the United States, federal district of the United States. The city is on the Potomac River, across from Virginia, and shares land borders with Maryland to its north and east. It was named after George Washington, the first president of the United States. The district is named for Columbia (personification), Columbia, the female National personification, personification of the nation. The Constitution of the United States, U.S. Constitution in 1789 called for the creation of a federal district under District of Columbia home rule, exclusive jurisdiction of the United States Congress, U.S. Congress. As such, Washington, D.C., is not part of any U.S. state, state, and is not one itself. The Residence Act, adopted on July 16, 1790, approved the creation of the Capital districts and territories, capital district along the Potomac River. The city ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seven-digit Dialing
Seven-digit dialing is a telephone dialing procedure customary in some territories of the North American Numbering Plan (NANP) for dialing telephone numbers in the same numbering plan area (NPA). NANP telephone numbers consist of ten digits, of which the leading three are the area code. In seven-digit dialing it is not necessary to dial the area code. The procedure is also sometimes known as ''local format'' or ''network format''. History Originally, telephone exchanges consisted of manual switchboards operated by switchboard operators. Telephone numbers had typically two to four digits, depending on the size of the community. As the number of subscribers grew, multiple exchanges served individual neighborhoods of large cities. Multiple exchanges were identified by a central office name and typically four digits, such as "Pennsylvania 5000". A rural telephone number, often party line, had often up to four digits and a letter or letter and digits to indicate which of the multiple p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WRC-TV
WRC-TV (channel 4) is a television station in Washington, D.C., serving as the market's NBC outlet. It is owned and operated by the network's NBC Owned Television Stations division alongside Class A television service, Class A Telemundo outlet WZDC-CD (channel 44). WRC-TV and WZDC-CD share studios on Nebraska Avenue in the Tenleytown neighborhood of Northwest Washington. Through a channel sharing agreement, the stations transmit using WRC-TV's spectrum from a tower adjacent to their studios. History The station traces its roots to experimental television station W3XNB, which was put on the air by the Radio Corporation of America, the then-parent company of NBC, in 1939. A construction permit with the commercial call signs in North America, callsign WNBW (standing for "NBC Washington") was first issued on channel 3 (60–66 MHz, numbered channel 2 prior to 1946) on December 23, 1941. NBC requested this permit to be cancelled on June 29, 1942; channel 3 was reassigned to Harr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ten-digit Dialing
Ten-digit dialing is a telephone dialing procedure in the countries and territories of the North American Numbering Plan (NANP). It is the practice of including the area code of a telephone number when Dialling (telephony), dialing to initiate a telephone call. When necessary, the ten-digit number may be prefixed with the trunk code ''1'', which is referred to as ''1+10-digit dialing'' or ''national format''. History The implementation and expansion of the North American Numbering Plan between 1947 and 1992 preserved a long-standing practice in the United States and Canada that callers should only need to dial the local seven-digit telephone number when placing a call within the caller's exchange area or within the home numbering plan area (NPA). In seven-digit dialing, callers dial the three-digit central office code and the four-digit station number of the destination telephone if it resides in the same numbering plan area. Dialing of an area code before the telephone number, ref ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North American Numbering Plan Administrator
The North American Numbering Plan (NANP) is an integrated telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1, World Numbering Zone 1 and has the telephone country code, country code ''1''. Some North American countries, most notably Telephone numbers in Mexico, Mexico, do not participate in the NANP. The concepts of the NANP were devised originally during the 1940s by the American Telephone and Telegraph Company (AT&T) for the Bell System and the independent telephone companies in North America in Operator Toll Dialing. The first task was to unify the diverse local telephone numbering plans that had been established during the preceding decades, with the goal to speed call completion times and decrease the costs for long-distance calling, by reducing manual labor by switchboard operators. Eventually, it prepared the continent for direct-dialing of long-distance calls ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Area Code 540
Image:Area code 540.png, 400px, The area colored red indicates the northern region of Virginia served by area code 540 poly 391 103 368 103 343 148 324 152 325 160 317 164 309 174 311 177 302 178 364 181 385 161 Area codes 757 and 948 poly 394 103 364 103 339 86 325 57 310 58 306 53 308 34 306 20 301 15 293 0 345 0 369 82 395 83 Area codes 410 and 443 poly 169 1 171 31 216 10 239 7 254 22 275 22 264 31 276 42 290 30 291 29 303 40 294 51 288 75 316 88 324 100 329 93 324 56 314 58 305 52 308 36 305 17 294 1 Area codes 240 and 301 poly 95 0 71 22 67 17 52 28 48 38 53 48 45 51 42 43 34 42 24 74 11 77 11 93 31 127 38 132 42 127 66 143 72 136 92 147 95 141 125 143 132 130 124 124 135 98 153 98 174 63 195 63 213 22 246 34 262 27 263 32 275 24 253 21 238 8 216 9 171 30 170 0 Area codes 304 and 681 poly 276 42 292 30 303 39 289 54 Area code 202 poly 112 180 111 171 131 166 136 169 150 165 163 169 180 139 186 138 187 135 185 127 213 88 231 89 234 92 233 129 241 127 240 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baltimore
Baltimore is the most populous city in the U.S. state of Maryland. With a population of 585,708 at the 2020 census and estimated at 568,271 in 2024, it is the 30th-most populous U.S. city. The Baltimore metropolitan area is the 20th-largest metropolitan area in the country at 2.84 million residents. The city is also part of the Washington–Baltimore combined statistical area, which had a population of 9.97 million in 2020. Baltimore was designated as an independent city by the Constitution of Maryland in 1851. Though not located under the jurisdiction of any county in the state, it forms part of the central Maryland region together with the surrounding county that shares its name. The land that is present-day Baltimore was used as hunting ground by Paleo-Indians. In the early 1600s, the Susquehannock began to hunt there. People from the Province of Maryland established the Port of Baltimore in 1706 to support the tobacco trade with Europe and established the Town ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Area Code 410
__NOTOC__ Year 410 (CDX) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year after the Consulship of Honorius and Theodosius (or, less frequently, year 1163 ''Ab urbe condita''). The denomination 410 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Spring – Constantine III crosses the Alps into Liguria (Northern Italy), but retreats to Gaul after Gerontius revolts in Spain against his son Constans II. * Raiders from Ireland, such as the Uí Liatháin and Laigin, harry the coasts of Wales. They plunder towns and capture slaves but later colonise large areas of what is called ''Gwynedd'', in particular Llŷn, the coasts of Arllechwedd, Arfon and the Isle of Mona (approximate date). * Flavius Constantius, Roman general and politician, is promoted to the rank of ''magister militum' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potomac River
The Potomac River () is in the Mid-Atlantic (United States), Mid-Atlantic region of the United States and flows from the Potomac Highlands in West Virginia to Chesapeake Bay in Maryland. It is long,U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map. Retrieved August 15, 2011 with a Drainage basin, drainage area of , and is the fourth-largest river along the East Coast of the United States. More than 6 million people live within its drainage basin, watershed. The river forms part of the borders between Maryland and Washington, D.C., on the left descending bank, and West Virginia and Virginia on the right descending bank. Except for a small portion of its headwaters in West Virginia, the #North Branch Potomac River, North Branch Potomac River is considered part of Maryland to the low-water mark on the opposite bank. The South Branch Potomac River lies completely within the state of West Virginia except for its headwaters, which lie i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interchangeable Central Office Code
Interchangeability can refer to: *Interchangeable parts Interchangeable parts are parts (wikt:component#Noun, components) that are identical for practical purposes. They are made to specifications that ensure that they are so nearly identical that they will fit into any assembly of the same type. One ..., the ability to select components for assembly at random and fit them together within proper tolerances * Interchangeability (computer science), the ability that an object can be replaced by another object without affecting code using the object * Interchangeable random variables in mathematics {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North American Numbering Plan Administration
The North American Numbering Plan (NANP) is an integrated telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1, World Numbering Zone 1 and has the telephone country code, country code ''1''. Some North American countries, most notably Telephone numbers in Mexico, Mexico, do not participate in the NANP. The concepts of the NANP were devised originally during the 1940s by the American Telephone and Telegraph Company (AT&T) for the Bell System and the independent telephone companies in North America in Operator Toll Dialing. The first task was to unify the diverse local telephone numbering plans that had been established during the preceding decades, with the goal to speed call completion times and decrease the costs for long-distance calling, by reducing manual labor by switchboard operators. Eventually, it prepared the continent for direct-dialing of long-distance calls ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Verizon Communications
Verizon Communications Inc. ( ), is an American telecommunications company headquartered in New York City. It is the world's second-largest telecommunications company by revenue and its mobile network is the largest wireless carrier in the United States, with 146 million subscribers as of March 31, 2025. The company was formed in 1983 as Bell Atlantic as a result of the breakup of the Bell System into seven companies, each a Regional Bell Operating Company (RBOC), commonly referred to as "Baby Bells." The company was originally headquartered in Philadelphia and operated in the states of Pennsylvania, New Jersey, Delaware, Maryland, Virginia, and West Virginia. In 1997, Bell Atlantic expanded into New York and the New England states by merging with fellow Baby Bell NYNEX. While Bell Atlantic was the surviving company, the merged company moved its headquarters from Philadelphia to NYNEX's old headquarters in New York City. In 2000, Bell Atlantic acquired GTE, which operat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
