City
Ontario
Ontario is a city record. City or town offices may handle local rules inside their limits, while county offices still handle records, taxes, courts, and many services.
Starting point
Confirm the address is inside local limits first.
If the address is inside Ontario, city or town offices may handle local permits, code, and services. If it is outside limits, county routing may be the better first stop.
A mailing city is not always the same as city government jurisdiction.
2025 population
187,013
Land area
49.984 sq mi
Water area
0.029 sq mi
Directory notes
Local layers to keep on the same page.
Confirm city or town limits.
A mailing address can use a nearby place name. If the address is outside limits, county offices may handle permits, code, and land-use routes.
County still matters.
San Bernardino County can still matter for assessor, tax collector, recorder, court, public health, social service, and election records.
Some layers are separate.
Water, sewer, fire, school, utilities, coast, earthquake maps, wildfire zones, parks, and trails may point outside city hall.
County layer
County shown for Ontario
Practical notes
Office, map, permit, and paperwork notes for Ontario
Place note · Cars and driving · Reviewed July 7, 2026
Ontario street sweeping needs a real curb check
Ontario street sweeping has posted routes and enforcement information, so drivers should match the curb sign, the schedule, and any citation details.
Place note · Home and property · Reviewed July 6, 2026
Ontario uses one city counter for water, sewer, and waste billing
Ontario Utilities Customer Service sets up service and handles billing for water, sewer, and integrated waste services.
Place note · Rules and licenses · Reviewed July 4, 2026
Ontario building permits start with the permit portal
Ontario's building permit pages point residents to the permit portal for plan check status, permit status, and electronic building permit work.
Place note · Rules and licenses · Reviewed July 4, 2026
Ontario business licenses should match the real business setup
Ontario requires a business license before doing business in the city, and a new application is needed when the business changes location or ownership.
Place note · Home and property · Reviewed July 4, 2026
Ontario emergency prep starts with AlertOntario
Ontario's ReadyOntario and AlertOntario pages give residents a local way to prepare for emergencies, choose alert devices, and keep text or email notices close by.
Place note · Rules and licenses · Reviewed July 3, 2026
myOntario is a first stop for many city service issues
Ontario residents can use the myOntario app and city contact pages to report maintenance issues, service concerns, and community improvement problems with a location, photo, and short form.
Almanac notes
Stories and local context near Ontario
Place note · History and culture
Ontario Motor Speedway Park keeps a race-track name in the neighborhood
Ontario Motor Speedway Park is a neighborhood park named for the former Ontario Motor Speedway, which closed after the 1980 race season.
Place note · History and culture
Graber Olive House keeps Ontario's farm roots close
Graber Olive House began from an early Ontario Model Colony farm lot, grew into a long-running olive business, and still helps the city remember its agricultural side.
Place note · History and culture
Ontario once had a mule car that coasted downhill
Ontario's early Euclid Avenue line used mules to pull riders uphill, then let the mules ride a trailer back down while gravity did the easy part.
Place note · Outdoors
Cucamonga-Guasti gives Ontario a lake-and-picnic park
Cucamonga-Guasti Regional Park is a 150-acre urban park in Ontario with two fishing lakes, picnic shelters, splash-pad space, and event areas.
County layer · History and culture
Chaffey-Garcia House keeps Rancho Cucamonga close to its citrus roots
Rancho Cucamonga's Chaffey-Garcia House gives Etiwanda a preserved home-and-citrus layer beside the city's newer foothill and Route 66 stories.
County layer · History and culture
Fontana Days Run is a community thread with long legs
The Fontana Days Run began as a local half marathon in 1955 and now helps carry one of the city's best-known civic traditions.
County layer · History and culture
The California Theatre keeps San Bernardino's movie-palace layer
San Bernardino's California Theatre is a 1928 downtown landmark, with movie-palace roots, live performances, and a long civic role.
County layer · History and culture
Chino's Old Schoolhouse Museum keeps the first classroom close
Chino's Old Schoolhouse Museum began as the city's first schoolhouse in 1888, then became a social hall, historical society museum, and city-owned history stop.