Area codes 909 and 840 are telephone

area code A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, re ...

s 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 Los Angeles County, officially the County of Los Angeles, and sometimes abbreviated as L.A. County, is the most populous county in the United States and in the U.S. state of California, with 9,861,224 residents estimated as of 2022. It is th ...

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 2,18 ...

in the U.S. state of

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 ...

. Area code 909 was split from area code 714 on November 14, 1992. By August 1993, dialing of the area code became mandatory. Western Riverside County was split off from 909 into area code 951 on July 17, 2004. 909 still covers small portions of Corona, Riverside, Moreno Valley, and the entire city of Calimesa 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 Area code 917 is a telephone area code in the North American Numbering Plan for the five boroughs of New York City: The Bronx, Brooklyn, Manhattan, Queens, and Staten Island. It is an overlay code to all numbering plan areas (NPAs) in the city, ...

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 U ...

), 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 plans, 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 __NOTOC__ Year 905 ( CMV) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. Events By place Europe * Spring – King Berengar I of Italy arranges a truce with the Hungarians, on p ...

and the last of the N10 area codes that were allowed before the introduction of

interchangeable NPA codes In the North American Numbering Plan (NANP), interchangeable NPA and central office codes constituted a change in numbering plan design and policy, to mitigate exhaustion of the numbering resources of the ten-digit telephone numbers used in the c ...

in 1995.

Service area

Los Angeles County

Claremont Claremont may refer to: Places Australia *Claremont, Ipswich, a heritage-listed house in Queensland * Claremont, Tasmania, a suburb of Hobart * Claremont, Western Australia, a suburb of Perth ** Claremont Football Club, West Australian Footba ...

* Diamond Bar * Glendora (mostly in the

626 area code Area code 626 is a telephone area code that was split from area code 818 in the U.S. state of California, on June 14, 1997. It covers most of the San Gabriel Valley and nearby areas in the northeastern portion of Los Angeles County, California, U. ...

) * City of Industry (mostly in the

and small portion in the 562 area code) * La Verne *

Pomona Pomona may refer to: Places Argentina * Pomona, Río Negro Australia * Pomona, Queensland, Australia, a town in the Shire of Noosa * Pomona, New South Wales, Australia Belize * Pomona, Belize, a municipality in Stann Creek District Mexico ...

Rowland Heights Rowland Heights is an unincorporated area in and below the Puente Hills in the San Gabriel Valley, in Los Angeles County, California, United States. The population was 48,231 at the 2020 census. Rowland Heights is in the Los Angeles metropoli ...

(also in the

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 tru ...

(small portion in the

) * West Covina (mostly in the

)

Riverside County

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

San Bernardino County

* Big Bear City * Big Bear Lake * Bloomington *

Blue Jay The blue jay (''Cyanocitta cristata'') is a passerine bird in the family Corvidae, native to eastern North America. It lives in most of the eastern and central United States; some eastern populations may be migratory. Resident populations are ...

Chino Hills The Chino Hills are a mountain range on the border of Orange, Los Angeles, and San Bernardino counties, California, with a small portion in Riverside County. The Chino Hills State Park preserves open space and habitat in them. Geography The C ...

(small portion in the 657/714 area code) * Chino * Colton * Crestline * Fontana * Grand Terrace *

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 Lake Arrowhead or Arrowhead Lake may refer to: United States Bodies of water * Arrowhead Lake (Idaho) * Lake Arrowhead Reservoir, California * Lake Arrowhead, Georgia * Lake Arrowhead (Maine) Communities * Arrowhead Lake, Cumberland County, New J ...

Loma Linda Loma Linda (Spanish for "Beautiful Hill") is a city in San Bernardino County, California, United States, that was incorporated in 1970. The population was 24,791 at the 2020 census, up from 23,261 at the 2010 census. The central area of the c ...

* Lytle Creek * Mentone * Montclair *

Muscoy Muscoy is a census-designated place (CDP) in San Bernardino County, California, United States. The population was 10,644 at the 2010 census, up from 8,919 at the 2000 census. Muscoy shares ZIP code 92407 with the communities of Verdemont, Devore ...

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 Rancho Cucamonga was a Mexican land grant in present-day San Bernardino County, California, given in 1839 to the dedicated soldier, smuggler and politician Tiburcio Tapia by Mexican governor Juan Bautista Alvarado. The grant formed parts of pres ...

* 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 Rial ...

Running Springs Running Springs is a census-designated place (CDP) in San Bernardino County, California, United States. The population was 5,268 at the 2020 census, up from 4,862 at the 2010 census. Running Springs is situated 17 miles west of the city of Big Bear ...

San Antonio Heights San Antonio Heights is a census-designated place (CDP) in the San Bernardino County, California. It is in the northern Pomona Valley and the foothills of the San Gabriel Mountains. The population was 3,371 at the 2010 census, up from 3,122 at t ...

* San Bernardino *

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 ...

Upland Upland or Uplands may refer to: Geography *Hill, an area of higher land, generally *Highland, an area of higher land divided into low and high points *Upland and lowland, conditional descriptions of a plain based on elevation above sea level *I ...

* Yucaipa

References

External links