Cold email software for B2B companies in Wilmington, DE
Acqro researches every company on your Wilmington target list and writes each email from what it finds. Below is verified federal data on the New Castle County market that contains Wilmington, and how to turn it into an outbound list.
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How big is the B2B market in Wilmington?
New Castle County, which includes Wilmington, had 17,855 business establishments in 2023, 4,678 of them with 10 to 249 employees, according to the U.S. Census Bureau. Acqro is AI cold email software that researches each target company before writing, then sends through authenticated domains with verification, warmup and throttling built in.
The Wilmington B2B market in numbers
Figures cover New Castle County, Delaware, the county that contains Wilmington. County Business Patterns does not publish city-level industry detail.
- Business establishments
- 17,855+1.0% vs 2022Census CBP 2023
- Firms with 10–249 employees
- 4,678Census CBP 2023
- Paid employees
- 306,745Census CBP 2023
- Average annual pay
- $81,219Census CBP 2023
- Professional services firms
- 2,857Census CBP 2023, NAICS 54
- County GDP
- $71.3B+5.3% 2022–2023BEA CAGDP2 2023
73.1% of establishments in New Castle County have fewer than 10 employees, in line with the 73.0% share for the United States. The 4,678 establishments with 10 to 249 employees are where most B2B lists should start: large enough to have a budget and a defined buyer, small enough that an owner or department head still makes the call and reads their own email.
By employment, the largest sectors are health care and social assistance (16.4% of jobs) and finance and insurance (13.1% of jobs). Relative to the national mix, finance and insurance (13.1% locally against 5.0% nationally) and professional, scientific and technical services (10.1% locally against 7.4% nationally) stand out, which makes them natural first segments for outbound.
The number of establishments changed by +1.0% between 2022 and 2023, faster than the +0.8% change for the United States. New and growing businesses are the accounts most likely to be choosing vendors for the first time, so pair that list with research on hiring, new locations and leadership changes before writing a single email.
Which industries employ the most people in New Castle County
Sectors ranked by paid employment, with each sector's share of local jobs compared with its national share.
| Sector | Establishments | Employees | Avg. annual pay | Share of jobs | US share |
|---|---|---|---|---|---|
| Health care and social assistance | 1,871 | 50,428 | $70,432 | 16.4% | 15.8% |
| Finance and insurance | 1,317 | 40,155 | $125,331 | 13.1% | 5.0% |
| Retail trade | 2,000 | 38,161 | $36,976 | 12.4% | 11.5% |
| Professional, scientific and technical services | 2,857 | 31,116 | $135,897 | 10.1% | 7.4% |
| Accommodation and food services | 1,345 | 25,616 | $23,743 | 8.4% | 10.4% |
| Administrative, support and waste management services | 1,083 | 17,592 | $53,971 | 5.7% | 9.6% |
| Construction | 1,378 | 15,732 | $76,639 | 5.1% | 5.5% |
| Wholesale trade | 794 | 15,404 | — | 5.0% | 4.5% |
| Manufacturing | 425 | 14,682 | $97,910 | 4.8% | 8.8% |
| Transportation and warehousing | 517 | 13,484 | $50,633 | 4.4% | 4.7% |
Wilmington businesses by company size
Company size decides who to email: owners at the smallest firms, department heads in the middle, specialist buyers at the largest.
| Company size | Establishments | Share | US share |
|---|---|---|---|
| 1 to 4 employees | 10,239 | 57.3% | 55.5% |
| 5 to 9 employees | 2,819 | 15.8% | 17.5% |
| 10 to 19 employees | 2,137 | 12.0% | 12.5% |
| 20 to 49 employees | 1,606 | 9.0% | 9.1% |
| 50 to 99 employees | 579 | 3.2% | 3.0% |
| 100 to 249 employees | 356 | 2.0% | 1.7% |
| 250 or more employees | 119 | 0.7% | 0.7% |
B2B service firms in New Castle County
Establishment counts for the service industries Acqro customers most often work in. Each links to an industry-specific outreach guide.
| Industry | Census industry (NAICS) | Establishments |
|---|---|---|
| Software Development Agencies | Custom Computer Programming Services | 500 |
| Law Firms | Offices of Lawyers | 341 |
| Management Consultants | Administrative Management and General Management Consulting Services | 274 |
| Healthtech Vendors | Computer Systems Design Services | 268 |
| Commercial Real Estate Brokers | Offices of Real Estate Agents and Brokers | 226 |
| SaaS Companies | Software Publishers | 224 |
| Commercial Insurance Brokers | Insurance Agencies and Brokerages | 192 |
| SEO Agencies | Marketing Consulting Services | 165 |
| Commercial Cleaning Companies | Janitorial Services | 164 |
| Cybersecurity Firms | Other Computer Related Services | 108 |
| Financial Advisory Firms | Investment Advice | 100 |
| Staffing Agencies | Temporary Help Services | 99 |
How to build a cold email campaign for Wilmington
Pick segments from the data
Start with the sectors that are large or over-represented locally, such as health care and social assistance and finance and insurance, and only the ones your offer genuinely fits.
Filter by company size
Narrow to the size band your product serves; New Castle County has 4,678 establishments with 10 to 249 employees. A tight list of well-matched accounts outperforms a long loose one.
Verify every address
Remove hard bounces, role accounts and stale records before anything is queued. Keeping hard bounces under 2 percent protects the domains everything else depends on.
Research each company
Look for a reason to write now: hiring, a new location, a leadership change, a launch. For Wilmington prospects, local expansion news and job posts are usually the easiest signals to verify.
Send on protected infrastructure
Use secondary domains with SPF, DKIM and DMARC, warm them over three to four weeks, and keep each mailbox to 30 to 50 cold emails a day.
Cold email in Wilmington, answered
How many businesses are there in Wilmington, DE?
New Castle County, which contains Wilmington, had 17,855 business establishments in 2023 employing 306,745 people. Source: U.S. Census Bureau, County Business Patterns 2023. City-level industry counts are not published, so the county is the closest official geography.
What are the largest industries in Wilmington?
By paid employment in New Castle County, the largest sectors in 2023 were health care and social assistance (16.4% of jobs), finance and insurance (13.1% of jobs) and retail trade (12.4% of jobs). Source: U.S. Census Bureau, County Business Patterns 2023.
How many mid-sized companies are in Wilmington?
New Castle County had 4,678 establishments with 10 to 249 employees in 2023, the size range most B2B outbound campaigns target. Source: U.S. Census Bureau, County Business Patterns 2023.
Is cold email legal in the United States?
Yes. The federal CAN-SPAM Act permits commercial email to business contacts without prior consent, provided the message identifies the sender accurately, uses a truthful subject line, includes a valid physical postal address and a working opt-out, and honours opt-out requests promptly. CAN-SPAM applies in every state and preempts most state commercial email laws, except provisions aimed at falsity or deception. This is general information, not legal advice.
What does Acqro do differently from other cold email tools?
Most cold email tools send the copy and list you provide. Acqro researches each target company's public signals first, such as hiring, funding, launches and leadership changes, and drafts each email from that evidence, with verification, authenticated sending domains, warmup and a unified reply inbox built in.
Explore related pages
More in Delaware
Sources and methodology
Every figure on this page comes from a federal statistical release and is shown with its source and reference year. Figures the agencies withhold or publish with high noise are left out rather than estimated. Page updated September 17, 2026.
- U.S. Census Bureau, County Business Patterns 2023 and 2022: establishments, paid employment for the pay period including March 12, annual payroll, and establishments by employment size. Industries use NAICS 2017 codes.
- U.S. Bureau of Economic Analysis, CAGDP2: GDP by county in current dollars, 2023.
- Geography: Wilmington is located in New Castle County. Figures describe the whole county.
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