Area codes 909 and 840 are telephone area codes in the

North American Numbering Plan The North American Numbering Plan (NANP) is a 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 and has the international calling ...

(NANP) for the far-eastern part of Los Angeles County and southwestern

San Bernardino County San Bernardino County (), officially the County of San Bernardino, is a county located in the southern portion of the U.S. state of California, and is located within the Inland Empire area. As of the 2020 U.S. Census, the population was 2,181, ...

in the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sove ...

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...

. Area code 909 was split from

area code 714 Area codes 714 and 657 are telephone area codes covering northern Orange County, a portion of Los Angeles County, and the Sleepy Hollow and Carbon Canyon areas of Chino Hills in San Bernardino County in the U.S. state of California. Cities in th ...

on November 14, 1992. By August 1993, dialing of the area code became mandatory. Western

Riverside County Riverside County is a county located in the southern portion of the U.S. state of California. As of the 2020 census, the population was 2,418,185, making it the fourth-most populous county in California and the 10th-most populous in the Uni ...

was split off from 909 into

area code 951 Area code 951 is a California telephone area code that was split from area code 909 on July 17, 2004. It covers western Riverside County, including the cities and communities of Banning, Beaumont, Corona, Canyon Lake, Riverside, Temescal Val ...

on July 17, 2004. 909 still covers small portions of

Corona Corona (from the Latin for 'crown') most commonly refers to: * Stellar corona, the outer atmosphere of the Sun or another star * Corona (beer), a Mexican beer * Corona, informal term for the coronavirus SARS-CoV-2, which causes the COVID-19 di ...

, Riverside,

Moreno Valley Moreno Valley is a city in Riverside County, California, United States, and is part of the Riverside–San Bernardino–Ontario metropolitan area. It is the second-largest city in Riverside County by population and one of the Inland Empire's po ...

, and the entire city of

Calimesa Calimesa (portmanteau of ''California'' and ''Mesa'', Spanish language, Spanish for "mesa, table") is a city in Riverside County, California, Riverside County, California, United States in the Greater Los Angeles area. The population was 7,879 at ...

which are in Riverside County. Originally on the same date that 951 was split from 909, the geographic area retaining the 909 area code was to be overlaid by a new area code 752. However, lawsuits filed by the wireless industry in order to prevent California (and other states) from creating wireless-only area codes (after the creation of area code 917 in

New York City New York, often called New York City or NYC, is the most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the most densely populated major city in the Un ...

), which would have identified all customers with certain area codes as being wireless, put all overlays in California on hold for years. In the meantime,

number pooling Number pooling is a method of reallocating telephony numbering space in the North American Numbering Plan, primarily in growth areas in the United States. Instead of allocating blocks of ten thousand numbers to each carrier in each community, a bl ...

was introduced, making the 752 overlay unnecessary, and 752 was returned to the NANPA numbering pool to be assigned at a later date. On July 23, 2019, the California Public Utilities Commission approved an all-service overlay for area code 909 with the new area code 840, since February 23, 2021. A permissive dialing period was implemented from July 2020 to January 2021. While 840 numbers are issued to new subscribers, those with 909 numbers retain them. 840 is California's 36th area code. With its establishment, one half of California's 24 geographic numbering plan areas (NPAs) implement

overlay plan Overlay may refer to: Computers * Overlay network, a computer network which is built on top of another network * Hardware overlay, one type of video overlay that uses memory dedicated to the application *Another term for exec, replacing one proce ...

s, while the other twelve are single-code NPAs. Area code 909 is the second to the last new area code installed, with the digit ''0'' in the middle position. The rest of the original style area codes thereafter were 905 and the last of the N10 area codes that were allowed before the introduction of interchangeable NPA codes in 1995.

Service area

Los Angeles County

* Claremont *

Diamond Bar Diamond Bar is a city in eastern Los Angeles County, California, United States. At the 2010 census it had a population of 55,544, and in 2019 the population was estimated to be 55,720. It is named after the "diamond over a bar" branding iron re ...

* Glendora (mostly in the 626 area code) * City of Industry (mostly in the 626 area code and small portion in the 562 area code) * La Verne * Pomona * Rowland Heights (also in the 626 area code and small portion in the 562 area code) * San Dimas *

Walnut A walnut is the edible seed of a drupe of any tree of the genus ''Juglans'' (family Juglandaceae), particularly the Persian or English walnut, '' Juglans regia''. Although culinarily considered a "nut" and used as such, it is not a true ...

(small portion in the 626 area code) *

West Covina West or Occident is one of the four cardinal directions or points of the compass. It is the opposite direction from east and is the direction in which the Sun sets on the Earth. Etymology The word "west" is a Germanic word passed into some R ...

(mostly in the 626 area code)

Riverside County

(mostly in the 951 area code) * Eastvale (mostly in the 951 area code)

San Bernardino County

Big Bear City Big Bear City is an unincorporated community in San Bernardino County, California, United States along the east shore of Big Bear Lake and surrounded by the San Bernardino National Forest. It is northeast of the city of San Bernardino, and imme ...

* Big Bear Lake * Bloomington * Blue Jay * Chino Hills (small portion in the 657/714 area code) * Chino * Colton * Crestline * Fontana *

Grand Terrace Grand Terrace is a city in San Bernardino County, California, United States. The population was 12,040 at the 2010 census, up from 11,626 at the 2000 census. Grand Terrace is located between Highgrove and Colton, along the I-215 and Agua Man ...

Highland Highlands or uplands are areas of high elevation such as a mountainous region, elevated mountainous plateau or high hills. Generally speaking, upland (or uplands) refers to ranges of hills, typically from up to while highland (or highlands) is ...

* Lake Arrowhead * Loma Linda * Lytle Creek * Mentone * Montclair * Muscoy *

Ontario Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central C ...

* Rancho Cucamonga * Redlands *

Rialto The Rialto is a central area of Venice, Italy, in the ''sestiere'' of San Polo. It is, and has been for many centuries, the financial and commercial heart of the city. Rialto is known for its prominent markets as well as for the monumental Ria ...

* Running Springs * San Antonio Heights *

San Bernardino San Bernardino (; Spanish for "Saint Bernardino") is a city and county seat of San Bernardino County, California, United States. Located in the Inland Empire region of Southern California, the city had a population of 222,101 in the 2020 cen ...

Sugarloaf A sugarloaf was the usual form in which refined sugar was produced and sold until the late 19th century, when granulated and cube sugars were introduced. A tall cone with a rounded top was the end product of a process in which dark molasses, a r ...

* Upland * Yucaipa

References

External links

North American Numbering Plan Administration
{{coord, 34.1, -117.5, region:US-CA_type:adm2nd_dim:50km, display=title

909 __NOTOC__ Year 909 ( CMIX) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. Events By place Britain * King Edward the Elder and his sister, Princess Æthelflæd of Mercia, raid Danish ...