Quick answer: The best data source depends on how visible your buyer is online. Storefronts and facilities show up on Google Maps. Corporate offices, multi-site operators, and property management firms show up in LinkedIn-based databases like Apollo. Hospitals, nursing homes, restaurants, and new construction show up in government registries and permit records. Buyers who have already announced a need show up on bid portals like SAM.gov. No single source covers a whole market: in our own list-building work, Apollo alone reaches roughly 10% to 15% of local and blue-collar businesses, so most teams need two sources plus an enrichment step.
Key takeaways
If you sell hands-on services to businesses (cleaning, pest control, HVAC, landscaping, electrical, security, facility maintenance), your first problem isn't the email. It's the list. "Restaurants in Dallas" is a category. A list of 600 named restaurants, each with an address, a decision-maker, and a working email, is a campaign. Every source below solves part of that, and none solves all of it.
A usable list has three layers, and different sources supply different ones.
The seven sources below mostly solve the first layer, and a few hint at the second. The third layer usually takes a separate enrichment step, which we cover near the end.
| Source | Best for | What you get | What it doesn't give you |
|---|---|---|---|
| Google Maps | Restaurants, clinics, gyms, retail, any physical business | Name, address, phone, website, category, reviews | Decision-maker names and emails |
| Apollo and other LinkedIn-based databases | Corporate offices, multi-site operators, property management firms | Named roles, titles, company size, emails for the slice it covers | Coverage of owner-operated businesses |
| Government facility and license registries | Hospitals, nursing homes, dialysis centers, child care, assisted living | Official facility names, addresses, and types | Contact people |
| Health-inspection and code-violation records | Restaurants and food facilities | Inspection dates and cited violations | Contact people |
| Building permit records | New construction and renovations | Project address, permit type, dates, often applicant names | The eventual facility contact |
| Government bid portals | Public buildings, schools, federal facilities | Live solicitations, scope, deadlines, NAICS codes | Private-sector accounts |
| Trade associations, property records, and business registries | Property managers, building owners, multi-site operators | Who owns or manages a building | Direct emails, in most cases |
Maps covers what people walk into: restaurants, medical and dental offices, gyms, retail, auto shops, hotels. If a business has a physical address or service area, it is almost certainly listed, because customers need to find it and the owner has a reason to keep the listing current. That is why Maps reaches close to a full market where LinkedIn-based tools reach a sliver.
A listing gives you a name, address, phone number, category, website, and reviews. It doesn't give you a decision-maker or an email. That comes from enrichment. We break down the coverage numbers in our Apollo vs Google Maps comparison. Reviews are a useful bonus: a run of complaints about cleanliness at a clinic or a restaurant is a reason to reach out.
Best for: any target that looks like a storefront or a facility.
Apollo, ZoomInfo, and LinkedIn Sales Navigator build their data from LinkedIn profiles and corporate web pages. That works well when your buyer is a regional property manager, a facilities director at a manufacturer, or an operations lead at a multi-site company, because those people have profiles, titles, and company pages that map onto the filters.
It works poorly for owner-operated businesses. In our own list-building work, Apollo covers roughly 10% to 15% of the businesses in a typical blue-collar or local-service market, and only about 40% to 45% of those come with a usable decision-maker email. Those figures are directional and come from local-service businesses. We'd expect the gap to appear with any owner-operated buyer, such as an independent restaurant or clinic, and to narrow for corporate buyers, though we haven't measured that.
Best for: corporate offices, industrial sites, property management companies, and multi-site operators.
Regulated facilities appear in public registries because someone has to license them. The federal Centers for Medicare and Medicaid Services (CMS) publishes downloadable provider data through its Provider Data Catalog, including nursing homes, and its Provider of Services file covers hospitals and other facility types. Many states also publish licensed child care centers and assisted living facilities through their health or human services departments. Format and completeness vary by state.
These lists are useful because they're official: the facility exists, it's operating, and you get its address and type. If you clean, service HVAC for, or provide pest control to healthcare facilities, this is a strong starting point. The lists don't name the person who buys your service, so the second and third layers still need work.
Best for: trades targeting healthcare, child care, and senior living.
Many cities and counties publish restaurant inspection results as open data. New York City's restaurant inspection dataset on NYC Open Data is a well-known example. These records list inspected establishments and the violations cited against them.
For a pest control company, a cited violation is a timing signal. A restaurant with a recent pest-related citation has a reason to reconsider its provider, which is the trigger cold outreach otherwise lacks. Lead with your service and your availability, not with the violation itself, and check that your city or county actually publishes this data before you plan around it.
Best for: pest control, deep cleaning, and sanitation trades targeting food service.
Cities such as Chicago publish building permit records as open data. A permit tells you a building is being built or renovated, where it is, and usually when. That timing is useful because new and renovated buildings need vendors: post-construction cleaning, HVAC service, landscaping, security, electrical work.
The catch is who you reach. A permit often names the contractor or applicant, not the facility manager who will run the building once it opens. You catch the project early and find the right person a step or two later.
Best for: any trade that gets hired when a building opens or changes.
Public buyers announce their needs. SAM.gov, the federal government's contract opportunities site, lists solicitations you can search by NAICS code. Janitorial services is code 561720. Registering to bid is free. States, counties, cities, and school districts run their own procurement portals on the same idea.
This is demand that has already been declared, which makes it the opposite of cold outreach. The tradeoffs are competition, since bids are public and everyone sees them, and paperwork. For some trades, especially janitorial and grounds maintenance, it is a real channel and worth setting up alerts for.
Best for: trades willing to bid on public buildings, schools, and federal facilities.
Three related sources answer a question the others skip: who owns or manages the building?
None of these hands you a list of emails. They tell you which management company or owner sits behind a building, so you can find that company and the right person at it.
Best for: property portfolios, multi-tenant buildings, and any target where the buyer is the manager or owner rather than the occupant.
The pattern across all seven: the more a buyer looks like a corporation, the more likely a LinkedIn-based database has it. The more a buyer looks like a storefront or a licensed facility, the more likely Maps or a public registry does.
In practice, most target markets need two sources: one to find accounts and another to find who owns the buying decision. Food service pairs Maps with inspection records. Healthcare pairs CMS data with Maps for phone numbers and websites. Office buildings pair property management firms found through Apollo with property records and BOMA or IREM chapters.
Every source above gives you accounts. To reach a person, you need enrichment: identifying who owns the vendor decision at each account and finding or verifying an email for them. That usually means combining website research, email-finding tools, AI-assisted lookups, and verification.
Our directional figures show how much this step matters. Apollo's ready-to-use yield in a local-service market is roughly 5% of the true market: about 10% to 15% coverage, multiplied by the 40% to 45% of those that come with a decision-maker email. A Google Maps list starts with no emails at all, but with a proper enrichment stack it can reach 70% to 80% email coverage, counting generic and personal addresses together. A named decision-maker email is a smaller subset of that, so a generic info@ address is a weaker contact than a direct one. For any source, the enrichment step decides whether you have a prospect list or a market map.
Work backward from the meetings you want. Our cold email math article lays out the formula: sends needed equals meetings wanted divided by your booked-meeting conversion rate.
That is why list size matters before you commit to a channel. If your territory contains only a few hundred qualifying accounts, outbound runs out of runway quickly. Our comparison of cold email and Google Ads covers what to do in that case.
Sourcing accurate, decision-maker-level data for blue-collar and local-service markets is a real part of the work before any outreach email goes out. We combine what a database like Apollo covers with Maps-based sourcing, public records, and enrichment for the rest, so a campaign reaches the full universe of accounts and not just the slice with a digital footprint.
This is also the part of outbound most companies don't want to build themselves, and don't need to. We already run the tech stack this requires: sourcing the businesses, identifying the decision-maker at each one, and finding and verifying a real email for that person at the volume a campaign needs. Instead of assembling that stack in-house, most companies are better served handing list-building and enrichment to a team that runs it every day.
It depends on who you sell to. Google Maps works best for storefront-type accounts like restaurants, clinics, and retail. LinkedIn-based databases like Apollo work best for corporate offices and property management firms. Government registries work for healthcare and senior living. Most companies get the best list by combining two sources, then enriching for decision-makers.
Public registries, permit records, and bid portals are generally free to access, though terms and formats vary by agency, and some counties charge for bulk property records. Free data doesn't remove your obligations as a sender. Under CAN-SPAM, commercial email, including B2B email, needs accurate sender details, a valid postal address, and an opt-out.
Google's terms restrict some kinds of automated data extraction from Maps, so read the terms of any tool you use before building a process on it. Many teams use a licensed data provider or a tool that handles this on their behalf.
For corporate buyers such as property management firms and industrial operators, Apollo is a strong base. For owner-operated businesses, our directional figures show it covering roughly 10% to 15% of a market, so it works better as one source among several.
The title varies by account: a facility manager or director of facilities, a property manager, an operations or plant manager, an office manager, or the owner. Company websites, LinkedIn, and enrichment tools help identify the right person, and the right title differs by industry and building size.
Public registries update on their own schedules, and businesses close, move, or change managers constantly. Verify emails and confirm a business is still operating before you send.