Aerial photo of "Villages of Kapolei" neighborhood
The Second City of Oʻahu, Hawaiʻi's e-City 
Latitude and Longitude:
|• County Mayor||Kirk Caldwell (D)|
|• Representative||Sharon Har (D)|
|• Total||4.1 sq mi (10.7 km2)|
|• Land||4.1 sq mi (10.7 km2)|
|• Water||0 sq mi (0 km2)|
|Elevation||51 ft (16 m)|
|• Density||26,000/sq mi (10,000/km2)|
|Time zone||UTC-10 ( Hawaiʻi-Aleutian (HST))|
Kapolei is a planned community in Honolulu County, Hawaiʻi, United States, on the island of Oʻahu. It is colloquially known as the "second city" of Oʻahu,  in relation to Honolulu. Officially, it is a census-designated place (CDP) within the consolidated city-county of Honolulu.
The community takes its name from a volcanic cone, Puʻu o Kapolei. In the Hawaiian language, puʻu means "hill" and Kapo lei means "beloved Kapo". According to legend, Kapo, Goddess of Fertility was sister to Pele, Goddess of Fire and Nāmaka, Goddess of the Sea.
Much of the land is part of the estate of industrialist James Campbell. Kapolei's major developer is Kapolei Property Development, a subsidiary of James Campbell Company.  Kapolei sits primarily upon former sugarcane and pineapple fields.
 In 1955 the Kapolei master plan was drafted and revised 3 different times beginning in 1974. In 1977 the new General Provision Plan adopted the Oʻahu General Plan which dubbed Kapolei "second urban center" (SUC) on the island of Oʻahu. In 1986 the ʻEwa Master Plan was revised to include the SUC and the initial residential construction in the Kapolei area began in the late 1980s with commercial developments springing up shortly thereafter. Nearly two decades later, in 2006 the Kapolei area had more than 800 companies, agencies, and organizations making up approximately 25,000 jobs. As of the 2010 census, the Kapolei CDP had a population of 15,186 people. 
The original development objectives for the City of Kapolei were to include: an employment center, a new center for offices and businesses, a center for government offices, a city of people walking, biking, or bussing, the latest energy-efficient technologies such as water conservation and recycling, and the most efficient connectivity for commuting on Oʻahu. In essence a "smart city". The design plan for development ensures that the 7 themes of Kapolei remain the same throughout its construction. These include 1. Hawaiian Garden City 2. Healthy Living 3. Complete Community Services 4. Pedestrian-friendly 5. Past/Present/Future design architecture 6. Sustainability 7. Technology.
Kapolei is quickly becoming the second urban center of Oʻahu, Hawaiʻi's most densely populated island. Much of Oʻahu's future population growth is projected for the Kapolei area, ʻEwa Plain, and southern slopes of the island's central valley, between Waipahu near Pearl Harbor and Wahiawā near the island's center.
The U.S. postal code for Kapolei is 96707. In 2002, Pacific Business News reported that 96707 had the second highest median income on the island of Oʻahu, at $62,303. Sperlings's Best Places reports Kapolei's median income of $70,129, compared to the national average of $42,350. Nearly one household in five has income exceeding $100,000, with a home ownership rate of 70%.
Other communities in the Kapolei area are the census-designated places of Makakilo and Naval Air Station Barbers Point (now known as Kalaeloa), the industrial area known as Campbell Industrial Park with the state's second largest deepwater port, Barbers Point Harbor,  and the resort and marina community of Ko Olina, which includes the Disney Aulani Resort and Ko Olina Golf Club.
Ongoing road construction has not resolved continuing traffic problems. A Manawai Street-Kama‘aha Avenue extension was completed in August 2006 and helped to reduce congestion along Kamokila Boulevard and Farrington Highway. Kapolei Property Development began construction in January 2007 on a $2 million road to extend Kamokila Boulevard from Kapolei Parkway to Roosevelt Avenue. Kapolei Property Development recently contributed $6 million for a joint project with the State Department of Transportation for an additional freeway on-ramp.
Although state and county governments and some of Hawaiʻi's largest companies have significant workplaces in Kapolei, population growth has far out-paced local job creation. A majority of Kapolei adults work in Honolulu, congesting the main traffic artery, Interstate H-1. In December 2006, the Honolulu City Council approved a fixed-guideway elevated rail system connecting Kapolei to Downtown Honolulu. In January 2007, Oʻahu residents saw an increase of 0.5 percent to the general excise tax to help cover the costs of construction of the system. The project broke ground in East Kapolei on February 22, 2011. Work on the foundations for the concrete pillars began shortly after in Waipahu; work to install the pillars started in East Kapolei in April 2012, and the first phase of the project is expected to start service to Aloha Stadium in late-2020.
- Highest temperature recorded 96 °F (36 °C) in August 2016
- Lowest temperature recorded 49 °F (9 °C) in March 2005
- Average high temperature in July, 88 °F (31 °C)
- Average low temperature in July, 69 °F (21 °C)
- Average high temperature in December, 80 °F (27 °C)
- Average low temperature in December, 60 °F (16 °C)
- Average rainfall in July, 0 inches (0 mm)
- Average rainfall in December, 3.1 inches (79 mm)
- Honolulu High-Capacity Transit Corridor Project, a rail line that is being constructed and will link the Kapolei area to Downtown Honolulu and Honolulu International Airport. When the HART rail project is complete, the western terminus will be located in Kapolei. 
- Ka Makana Ali‘i, a mall that opened in October 2016, has 1.4 million square feet of retail space and more than a hundred stores.  Macy's Department Store is an anchor for the new mall. 
Kapolei is located at the southern end of the slopes of the Waiʻanae mountain near the neighborhood of Makakilo with Fort Barrette Road, located along and named for historically important Fort Barrette, connecting Makakilo to Kapolei. It is located on the ʻEwa Plain approximately 25 miles (40 km) from Honolulu. The Interstate H-1 freeway divides more recently developed Kapolei from Makakilo, and traveling eastward on H-1 connects to Waipahu. In the other direction, the freeway ends about 1 mile (1.6 km) west of Kapolei, merging into Farrington Highway (State Route 93) to Kahe and then to Nānākuli on the Wai‘anae Coast. Traveling eastward on Farrington Highway connects to Honouliuli. Exit 1 on H-1 is Kalaeloa Boulevard, the entrance to Barbers Point and Campbell Industrial Park. Less than 1 mile beyond (west of) the merge of H-1 and Farrington Highway is an off-ramp and overcrossing to the West Oʻahu resort area of Ko Olina.
Kapolei is officially governed by the government of Honolulu County. The county government covers the entire island of Oʻahu, with the county seat being at Honolulu Hale in Honolulu. The governmental body includes the Mayor of Honolulu County, the Honolulu City and County Council, and state representatives.
Kapolei Hale, built in 2001, serves as the civic center and main municipal building of the City of Kapolei.  The building contains an office for the Mayor, as well as offices of various city and county government agencies and is the headquarters for the City and County of Honolulu Department of Parks and Recreation.  However, the Permits Office for the Department of Parks and Recreation is located downtown Honolulu at the Frank F. Fasi Civic Center in the Frank F. Fasi Municipal Building at 650 South King Street.       
Additionally, federal, several state, and county department offices have been relocated to the Kapolei area.  In 2010 the Hawaiʻi State Judiciary Court relocated family court matters from cramped offices in downtown Honolulu to a newly constructed, technologically advanced building in Kapolei. 
The Federal Bureau of Investigation (FBI) Honolulu field office is in Kapolei at 91-1300 Enterprise Street.  Opened in 2013, it is the first federal agency to be headquartered in Kapolei. This Honolulu field office has jurisdiction over Hawaiʻi, Guam, Saipan, and American Samoa with resident agencies in Maui, Kona, Guam, and Saipan.    The previous site in downtown Honolulu was too small.  
The Hawaiʻi Department of Education operates public schools in Hawaiʻi. Public elementary schools serving Kapolei addresses include Barbers Point, Kapolei, Makakilo, and Mauka Lani. Island Pacific Academy (pre-K through 12), opened as a private school in 2004; Island Pacific Academy is an International Baccalaureate (IB) school offering IB classes to all grades. American Renaissance Academy (pre-K through 12), opened as a private school in 2007 in Kalaeloa, Naval Air Station Barbers Point. Kapolei Middle School and Kapolei High School serve older children with Kapolei addresses.
The University of Hawaiʻi–West Oʻahu relocated to Kapolei and opened its new campus in August 2012 at 91-1001 Farrington Highway and Hawaii Tokai International College relocated to Kapolei in April 2015.  
- "Hawaii Statewide Map of 2010 CDPs" (PDF). State of Hawaii Office of Planning. Hawaii Statewide GIS Program. p. 2. Retrieved 4 March 2020.
- "The City of Kapolei". Kapolei Property Development.
- "Kapolei Skyscraper Page". Skyscraper Source Media. Retrieved 2008-01-27.
- "About Us". Kapolei Property Development. Retrieved 2008-01-27.
- Kapolei Urban Design Plan
- "Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data (DP-1): Kapolei CDP, Hawaii". U.S. Census Bureau, American Factfinder. Retrieved May 22, 2012.
- "Government Services in Kapolei: City and County of Honolulu, the State of Hawaii, and the Federal government of the U.S." kapolei.com website. Retrieved August 7, 2018.
- Jack Carlsen and R.W. Butler, Ecotourism Series No. 8: Island Tourism: A Sustainable Perspective (Wallingford, UK: CAB International, 2011), 205.
- Ka Makana Ali‘i website, July 29, 2014, retrieved on July 20, 2017.
- Erika Engle, "Macy's to Anchor Kapolei Mall," Star Advertiser, May 29, 2014.
- "Kapolei Hale Opened". City and County of Honolulu, news release. February 8, 2001. Retrieved August 7, 2018.
- "About the City and County of Honolulu Department of Parks and Recreation". City and County of Honolulu: Department of Parks and Recreation website. Retrieved August 7, 2018.
- "Rule changes for Shore Water Events go into effect: Application deadline for first triennial calendar set for September 28, 2018". City and County of Honolulu: Department of Parks and Recreation website. July 29, 2018. Retrieved August 7, 2018.
- "Application for Use of Parks Facilities" (PDF). City and County of Honolulu: Department of Parks and Recreation website. Retrieved August 7, 2018.
- "Camping Rules" (PDF). City and County of Honolulu Department of Parks and Recreation. March 7, 2018. Retrieved August 7, 2018.
- "C&C of Honolulu Camping Permits". City and County of Honolulu Department of Parks and Recreation website. Retrieved August 7, 2018.
- "Camping brochure" (PDF). Department of Parks and Recreation. Retrieved August 7, 2018.
- "Camping Information". Department of Parks and Recreation. Retrieved August 7, 2018.
- Shikina, Robert (July 28, 2006). "Fasi's imprint made permanent". Honolulu Advertiser. Retrieved August 7, 2018.
- Chiem, Linda. " Lawyers see new Kapolei court as long, costly drive." Pacific Business News. January 31, 2010. Retrieved on September 19, 2011.
- " Contacting HPD Archived 2010-05-31 at the Wayback Machine." Honolulu Police Department. Retrieved on May 19, 2010.
- "District 8 - Kapolei/Waianae: Honolulu Police Department". Honolulu Police Department (HPD). Retrieved August 7, 2018.
- " Honolulu Division." Federal Bureau of Investigation. Retrieved on June 9, 2015. "91-1300 Enterprise Street Kapolei, HI 96707"
- Storms, Jade (2013). "FBI unveils new building in Kapolei". Hawai'i News Now (HNN). Retrieved August 7, 2018.
- "FBI Field Offices: Honolulu". FBI website. Retrieved August 7, 2018.
- "FBI building new Honolulu Field Office". Star-Advertiser. Honolulu. Associated Press. October 19, 2010. Retrieved August 7, 2018.
- "FBI gets new field office on 10-acre Hawaii site". Hawai'i News Now (HNN). Associated Press. 2013. Retrieved August 7, 2018.
- "University of Hawaiʻi at West Oʻahu". UH West Oʻahu website. Retrieved August 7, 2018.
- "University of Hawaiʻi News: Public invited to West Oahu campus grand opening". University of Hawaiʻi website. August 16, 2012. Retrieved August 7, 2018.
|Wikivoyage has a travel guide for Kapolei.|