Mooney & Boland · CA
Private Detective in Ontario, California
Confidential private detective inquiries for Ontario and the surrounding San Bernardino County area, coordinated by Mooney & Boland.
About Ontario
Private detective services in Ontario.
Located in San Bernardino County, Ontario is about 37 miles northeast of Long Beach. It is an incorporated city with about 180,547 residents (ACS 2020-2024) on 50.0 square miles of land. The Census Bureau counts it as a principal city of the Riverside-San Bernardino-Ontario, CA metropolitan statistical area.
Courts, employers and services for the surrounding region are concentrated in Ontario, so matters here range widely, from personal and family concerns to business disputes and litigation. About 19% of working residents are employed in education, health care and social assistance, the area's largest sector.
When you contact Mooney & Boland about a matter in Ontario, we listen first, explain what can lawfully be done in California, and set out scope and cost before any work begins.
Ontario at a glance
- Population
- 180,547 (ACS 2020-2024)
- Type of place
- An incorporated city
- County
- San Bernardino County
- Land area
- 50.0 sq mi · 3,612 people per sq mi
- Statistical area
- Riverside-San Bernardino-Ontario, CA (principal city)
- Major routes
- Interstate 10, Interstate 15
- Median age
- 33.5
- Median household income
- $88,900
- Owner-occupied homes
- 58%
- Average commute
- 31 minutes
Sources: U.S. Census Bureau ACS 5-year estimates (2020-2024), 2025 Gazetteer, OMB/Census CBSA delineations (2023), TIGER/Line roads. View the Census profile.
Investigations in Ontario
What can be arranged in Ontario.
A selection based on Ontario's setting. All 75 services are available; browse every service.
Employee Theft Investigations
Transportation, warehousing and distribution employers move valuable goods through the area.
International Investigative Research
About 28% of residents were born outside the United States, and some matters lead overseas.
Surveillance Investigations
Dense blocks, transit and limited parking shape how surveillance is staffed in Ontario.
Mobile Surveillance
With an average one-way commute of about 31 minutes, routines often extend well beyond Ontario.
Skip Tracing
People who relocate often move along Interstate 10 and the routes connecting Ontario to neighboring states.
Infidelity Investigations
Discreet, lawful documentation for relationship concerns.
Local considerations
Investigative considerations in Ontario.
City blocks and busy streets
Ontario has about 3,612 residents per square mile. Apartment buildings with several exits, limited parking and foot and transit traffic all make observation harder to sustain with one person. Staffing is decided up front, when scope and cost are agreed.
Highways and regional travel
Interstate 10 and Interstate 15 run through or near Ontario. Subjects in a mobile surveillance often leave town on these routes, so plans account for highway speeds, exits and where the work could cross into another jurisdiction. The same routes matter for locates: people who move frequently tend to follow them.
Long commutes and out-of-town routines
Workers in Ontario spend about 31 minutes getting to work on average (ACS 2020-2024). When someone's day happens mostly elsewhere, an investigation may begin in Ontario but continue across the region, which affects timing, staffing and cost.
Business and workplace matters
The largest employment sectors among Ontario residents are education, health care and social assistance (19%), retail trade (13%) and transportation, warehousing and utilities (13%). Employers in sectors like these sometimes need internal investigations, employee theft documentation or fact-finding on injury claims, carried out lawfully and with attention to employment law.
Surrounding area
Communities around Ontario.
The nearest large population center is Long Beach, about 37 miles away, with 455,548 residents.
Main routes: Interstate 10 and Interstate 15.
Investigations are not limited by municipal lines. A matter that begins in Ontario can continue into neighboring communities as part of the same engagement.
- Eastvale5 mi south · 70,633 residents
- Chino6 mi southwest · 92,652 residents
- Montclair6 mi northwest · 37,810 residents
- Upland6 mi northwest · 79,257 residents
- Rancho Cucamonga7 mi north · 175,411 residents
- Jurupa Valley8 mi east · 107,011 residents
Hiring in California
Hiring a private detective in California.
California requires a private detective license from the Bureau of Security and Investigative Services, part of the Department of Consumer Affairs, under the Business and Professions Code §§ 7512–7573.
To verify a license, use the regulator's lookup: Bureau of Security and Investigative Services (BSIS).
California generally requires the consent of all parties to record a confidential conversation. Deeds and property records for Ontario are recorded with the county recorder or register of deeds.
Questions
Private detective questions in Ontario.
How inquiries are coordinated
Private detectives in our network can assist with qualifying inquiries in Ontario. Each investigation is conducted by an independent private detective who holds the licensing required for the jurisdiction where the work takes place, where licensing is required.
How can I arrange a private detective in Ontario, CA?
Start with a confidential call to 629-310-8667 or an email describing what you need to know and why. We'll discuss what's possible and lawful in California, agree on scope and cost in writing, and coordinate the work with an independent private detective licensed for the jurisdiction where it takes place.
Do private detectives need a license in California?
California requires a private detective license from the Bureau of Security and Investigative Services, part of the Department of Consumer Affairs, under the Business and Professions Code §§ 7512–7573. The regulator is the Bureau of Security and Investigative Services (BSIS).
What should I know before hiring a private detective in San Bernardino County?
Most records that matter in San Bernardino County are kept at the county level: court files with the clerk, and deeds with the county recorder or register of deeds. A good detective searches those originals rather than relying on online summaries, and confirms identity so records aren't attributed to the wrong person.
The person I'm concerned about works outside Ontario. Can surveillance follow them?
Yes, within the law. Mobile surveillance can follow a routine into Long Beach and back, from public places. Plans account for travel time, and work in another state is handled by a detective licensed there.
Can a private detective find someone who left Ontario on Interstate 10?
Often. Locate work combines records research with field verification, wherever the trail leads. Moves along Interstate 10 and connecting highways are common, and investigations are coordinated across state lines with appropriately licensed detectives.
Can an investigation in Ontario extend to Eastvale or Chino?
Yes. People rarely stay inside municipal lines. Work that starts in Ontario can continue in nearby communities such as Eastvale, Chino, Montclair, planned as one engagement and carried out by detectives licensed for each place the work goes.
Can a business in Ontario arrange a workplace investigation?
Yes. Employers can arrange internal investigations, employee theft documentation and injury-claim fact-finding. Work is coordinated with counsel where appropriate and follows employment and privacy law.
More locations
More private detective pages near Ontario.
Every community page covers local geography, relevant investigations and state rules. Search all 14,263 cities and towns.
More in San Bernardino County
Riverside-San Bernardino-Ontario, CA metro
Confidential inquiry
Speak with our agency about your situation in Ontario.
Call, email or send a short confidential inquiry. You'll get a straight answer about what's possible, what's lawful and what it would involve.