Ontario business email list
Ontario, California has 5,326 businesses across the industries MapLeads indexes for this metro (63.3% website coverage, population estimate 164,270). This city business email list is your starting map for local prospecting — inspect real establishments below, open industry slices when you need tighter messaging, and unlock full exports with multi-maps scrapes or email packs. If you sell into local service businesses in Ontario, start here before you buy another opaque "metro file."
Ontario business market size
Counts are deduplicated by business name + ZIP inside MapLeads' dated maps index. Website coverage of 63% is a digitization signal, not a quality score.
Businesses
1,579
Local operators in Ontario — same business-row query as the table.
Website coverage
63%
Share of rows in the current filter with a website field (row aggregate).
Reachable pool
987
Rows in this filter with a website field — enrichment pool.
Outreach score
71
0–100 from current-filter volume and website coverage (query-time on rows).
Outreach calculator
Ontario businesses — start from the 987 operators with a website field (1,579 total in this cut). Adjust your average order value and close rate to size pipeline.
Formula: reachable pool (rows with a website field) × close rate × average order value. This is a planning estimate, not a forecast — actual conversion depends on offer, list quality, and follow-up.
| Business | Industry | Location | Phone | Website |
|---|---|---|---|---|
| ROARK | CFO & Controllers | Executi* | Business management c* | Ontario, CA | +1 909 *** **00 | roarkfs.com |
| H&R Block | Tax preparation servi* | Ontario, CA | +1 909 *** **89 | hrblock.com |
| Cifuentes & Associates Ltd. Liabili* | Tax preparation servi* | Ontario, CA | +1 888 *** **91 | taxnitro.com |
| Blink IT Solutions | Computer consultant; * | Ontario, CA | +1 909 *** **00 | blinkitsolutions.com |
| Xel Advisors, Inc., CPA | Accountant; Auditor; * | Ontario, CA | +1 949 *** **85 | — |
| H&R Block | Tax preparation servi* | Ontario, CA | +1 909 *** **33 | hrblock.com |
| Jackson Hewitt Tax Service | Tax preparation; Tax * | Ontario, CA | +1 951 *** **18 | jacksonhewitt.com |
| H&R Block | Tax preparation servi* | Ontario, CA | +1 909 *** **33 | hrblock.com |
| Kleinfelder | Engineering consultant | Ontario, CA | +1 909 *** **16 | kleinfelder.com |
| H&R Block | Tax preparation servi* | Ontario, CA | +1 909 *** **37 | hrblock.com |
| Hongda Tax and Accounting Services | Accountant; Certified* | Ontario, CA | +1 951 *** **38 | taxhf.com |
| Exquisite Consulting Services LLC | Tax preparation servi* | Ontario, CA | +1 800 *** **06 | exquisiteconsultingse* |
| Aida Real Professional Services | Tax preparation servi* | Ontario, CA | +1 909 *** **31 | aidarealnotary.com |
| Meza CPA Tax & Accounting | Certified public acco* | Ontario, CA | +1 909 *** **09 | meza.cpa |
| NARDOS BUSINESS SERVICES LLC | Tax preparation servi* | Ontario, CA | +1 909 *** **77 | nardosservices.com |
| Document Preparation Services Inc | Legal services | Ontario, CA | +1 909 *** **79 | — |
| Fernandez Income Tax | Tax preparation servi* | Ontario, CA | +1 909 *** **37 | fernandezit.com |
| NGP Consulting | Business management c* | Ontario, CA | +1 562 *** **18 | ngpconsults.com |
| David Evans and Associates, Inc. | Engineering consultan* | Ontario, CA | +1 909 *** **50 | deainc.com |
| Marketing.com | Envelope supplier; Ad* | Ontario, CA | +1 909 *** **85 | marketing.com |
Page 1 of 79 · 1,579 rows
Pull a live list for businesses in Ontario
MapLeads extracts local businesses from Google Maps, Apple Maps, and Bing Maps— or delivers a ready email list pack when you want a file without running a job. Start a trial, run a real search, and export to CSV the same day.
The Ontario market
Ontario, CA has 5,326 businesses in the MapLeads maps index, and 63.3% of them carry a website (3,371 businesses) — the practical ceiling for email enrichment here. Counts are deduplicated business records and refresh with each index update.
Industry mix
Largest verticals in Ontario: Restaurant (419 · 7.9%); Contractor (216 · 4.1%); Dentist (148 · 2.8%). Website presence differs by vertical — check the coverage column before planning volume.
Geography and scope
Ontario, CA is scoped as this city market only. Neighboring cities are separate pages with their own counts — they are not rolled into Ontario's 5,326 businesses.
Get this list
- Location: Ontario, CA.
- Category filter: restaurant (419 businesses in this market).
- Enrichment: on — 63.3% of businesses carry a website (3,371).
- Export, then verify emails where the plan allows; suppress known bounces before send.
FAQ: Ontario business email list
How many businesses are in Ontario?
Ontario, CA has 5,326 deduplicated businesses in the MapLeads maps index, and 63.3% of them carry a website (about 3,371). Counts refresh with each index update.
Does the Ontario list include the whole metro?
No. Counts cover Ontario, CA under this city key only — 5,326 businesses. Neighboring cities have their own market pages and are not folded into this total.
What is the biggest industry in Ontario?
Restaurant leads with 419 businesses — 7.9% of the city, ahead of Contractor at 216. 78.0% of restaurant rows carry a website.