Electrical repair · Ontario, California

Electrician for repairs and upgrades in Ontario, CA

Breaker keeps tripping, outlets dead, planning a panel upgrade or EV charger? 27% of Ontario's homes date from 1960–1979^[1] and 4% from 2020 or later. Request a licensed electrician who works here. Ontario, in San Bernardino County — ZIPs 91761, 91762, 91764, counts 187,013 residents (2025 estimate)^[2].

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Ontario at a glance for electrical

Population (2025 est.): 187,013^[2]+6.7% since 2020
County: San Bernardino^[2]
Land area: 50.0 sq mi^[3]
Population density: 3,741 / sq mi^[2]^[3]
Homes built 1960–1979: 27%^[1]the 4th-highest share of the 15 Inland Empire suburbs we cover
Homes built before 1960: 23%^[1]2020–2024
Homes built 2020 or later: 4%^[1]2020–2024
Homes heated with electricity: 22%^[1]the 2nd-highest share of the 15 Inland Empire suburbs we cover
Lightning-damage reports within 10 mi: 0^[4]2016–2025
Damaging-wind reports within 10 mi: 0^[4]2016–2025

What the local data means for electrical in Ontario

Ontario is one of the fastest-growing Inland Empire suburbs tracked here: 187,013 people (2025 estimate), up 6.7% since 2020^[2]. It covers 50.0 square miles (3,741 residents per square mile, the 7th densest), sits entirely in San Bernardino County, in ZIP codes 91761, 91762, 91764^[3].

New construction arrives with 200-amp panels and room to grow; the older homes nearby are the ones where panels fill up, double-taps appear, and an EV charger triggers a load calculation.

3 ZIP codes cover Ontario — 91761 (57% of the city's land), 91762 (27% of the city's land), 91764 (16% of the city's land)^[5].

The closest tracked neighbours are Eastvale (5.3 mi S), Chino (5.5 mi SW) and Rancho Cucamonga (6.8 mi N)^[3].

27% of Ontario's housing was built in 1960–1979^[1] — the 4th-highest share of the 15 Inland Empire suburbs we cover; nearby, Eastvale (2%), Chino (29%), and Rancho Cucamonga (25%). That window includes roughly 1965–1973, when some homes got aluminum branch wiring^[6].

22% of Ontario homes heat with electricity and 72% with gas^[1] — the 2nd-highest share of the 15 Inland Empire suburbs we cover (Eastvale (17%), Chino (17%), and Rancho Cucamonga (21%) nearby). Gas-heated homes often have more panel headroom, but only a load calculation tells.

No wind or lightning damage reports fall within 10 miles for 2016–2025^[4].

4% of Ontario's housing is from 2020 or later^[1] — new enough that builder warranties still apply to many electrical defects.

Measured against the 15 suburbs on this site, Ontario records the fewest lightning-damage reports nearby (0, tied with 5 other suburbs)^[4] and the 2nd-lowest share of detached houses (58%)^[1].

electrical help in Ontario: what to do next

Your request reaches Electrical repair contractors who serve Ontario (ZIP codes 91761, 91762, 91764).

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Before you call: when to call an electrician now

Whose wiring is it? Ontario homes by building type

38%^[1] of Ontario's homes are attached or in multi-unit buildings (multi-unit buildings alone: 29%, the 2nd-highest multi-unit share of the 15 Inland Empire suburbs we cover). In a condo or apartment the service entrance, meters and common-area wiring usually belong to the association or landlord, while work inside your unit is usually yours to arrange — check before you book.

After detached houses, the biggest group is 50 or more units: 5,311 of 55,966 housing units^[1].

For Ontario's 2,240 mobile homes (4.0%), ask for an electrician who works on manufactured homes.

Ontario's 55,966 housing units by building type, 2020–2024^[1]
Building type	Units	Share	Margin of error
Detached house	32,411	57.9%	±996
Attached house (townhouse, rowhouse)	4,981	8.9%	±608
Duplex (2 units)	1,154	2.1%	±311
3–4 units	4,051	7.2%	±538
5–9 units	2,197	3.9%	±354
10–19 units	2,138	3.8%	±426
20–49 units	1,458	2.6%	±337
50 or more units	5,311	9.5%	±625
Mobile home	2,240	4.0%	±377
Boat, RV, van, etc.	25	0.0%	±38

Margins of error are the Census Bureau’s 90% intervals; small categories in small cities are rough.

The Ontario numbers behind this page

How Ontario stacks up against the median suburb we cover (median of 15)^[1]^[4]
Measure	Ontario	Median of 15	Difference
Built before 1960	22.8%	6.5%	16 pts higher
Lightning-damage reports (10 mi)	0	1	1 fewer
Built 1960–79	27%	18%	9 pts higher
Built 1980–99	29%	41%	12 pts lower
Detached single-family	58%	73%	15 pts lower
Owner-occupied	58%	64%	6 pts lower
Median home value	$607,600	$618,900	2% lower

Sorted by largest difference. Each median is the middle value across the covered Inland Empire suburbs, from the same sources.

Ontario and nearby suburbs, side by side^[4]^[3]
City	Lightning reports	Damaging-wind reports
Ontario	0	0
Eastvale 5.3 mi	1	2
Chino 5.5 mi	1	0
Rancho Cucamonga 6.8 mi	0	0
Chino Hills 9.4 mi	1	1
Fontana 9.6 mi	1	1

When Ontario's 55,966 housing units were built^[1]
Built	Units	Share	Margin of error
2020 or later	2,509	4.5%	±435
2010 to 2019	5,500	9.8%	±637
2000 to 2009	3,841	6.9%	±488
1990 to 1999	4,700	8.4%	±856
1980 to 1989	11,576	20.7%	±787
1970 to 1979	10,209	18.2%	±836
1960 to 1969	4,854	8.7%	±526
1950 to 1959	7,712	13.8%	±557
1940 to 1949	2,174	3.9%	±344
1939 or earlier	2,891	5.2%	±375

ACS 2020–2024 estimates; margins of error are the Census Bureau's 90% intervals.

ZIP code areas covering Ontario^[5]
ZIP (ZCTA)	Share of Ontario's land	Share of the ZIP inside the city
91761	57%	100%
91762	27%	95%
91764	16%	100%

electrical questions from Ontario homeowners

Could my Ontario house have aluminum wiring?

Possibly, if built or rewired roughly 1965–1973^[6]; 27% of Ontario homes date from 1960–1979^[1].

Which Ontario ZIP codes are covered?

91761, 91762, and 91764^[5] — San Bernardino County. Neighbouring suburbs with their own pages: Eastvale (5.3 mi), Chino (5.5 mi), and Rancho Cucamonga (6.8 mi)^[3].

A lot of Ontario homes predate 1980 — what does that mean for wiring and panel work?

50% of Ontario's housing units were built before 1980, 22.8% before 1960^[1] — the 2nd-highest share of the 15 Inland Empire suburbs we cover. Houses of that age may have smaller panels or original wiring; ask for a panel and grounding check before adding a big load such as an EV charger.

My Ontario home is fairly new — could the wiring and panel still be under warranty?

Possibly: 14% of Ontario's housing units were built in 2010 or later^[1], the 4th-highest share of the 15 Inland Empire suburbs we cover. Check your closing paperwork for warranties before paying for a repair.

Sources

Data pulled Sep 28, 2026. Full citations and method.