Marketing agencies in Charleston, SC: 113 small offices and how to hire a three-person shop safely

This report is for Lowcountry businesses deciding whether to hire a local agency, and for vendors whose customers are small agencies. The figures cover the three-county metro: Charleston, Berkeley and Dorchester.

The count: 113 offices, mostly very small

US Census Bureau, County Business Patterns 2023, Charleston-North Charleston, SC Metro Area (CBSA 16700), NAICS 5418 (advertising, public relations and related services):

The Census Bureau publishes only the three smallest classes here; the other three offices have 20 or more employees, but how they split is withheld. Nationally, offices average about 12 employees and 69% have fewer than five; here 76% do.

"Not reported" means the Census Bureau published the number but flagged it as high-noise: the noise it adds for confidentiality moved the value by 5% or more, so it isn't reliable at this size.

What's not counted. CBP covers establishments with paid employees, so the many Charleston freelancers who work alone without payroll are missing, and an agency with offices downtown and in Mount Pleasant counts twice. It uses NAICS 2017 codes.

Agencies, consultants and designers

The agency rows add up to 112; one more office sits in a code too small to publish. The marketing consultancies employ 425 people, slightly more than all 113 agency offices together. In a market this size the label matters less than the work: many consultants run social, email and paid search for clients. The Census index also files custom SEO and web page design under 541511 (custom computer programming), so a web-and-SEO shop may show up there instead.

Hiring a small agency: what changes

A three-person agency can be excellent value. The risks are concentration and continuity, and the contract can handle both.

1. Meet the doers. Ask who writes, who designs and who runs the ads, by name. In an office of three, they're probably all in the pitch.
2. Agree a backup. What happens if your lead is out for two weeks, or leaves? Ask which freelancers the agency uses and get them bound by the same confidentiality terms.
3. Keep the keys. Ad accounts, analytics, the domain registration and social pages in your company's name, with the agency as a user. Google requires agencies to give advertisers their Google Ads customer ID on request and tells advertisers the agency must set up a separate account for each of them.
4. Own what you pay for. Ask for a written copyright assignment of logos, photos and site designs. The US Copyright Office explains that commissioned work counts as a work made for hire only in nine narrow categories, with a signed agreement.
5. Price the exit. A 30-day notice period, a handover list (files, passwords, ad account access) and no fee to release your own accounts.
6. Check the entity. Confirm the agency's registration with the South Carolina Secretary of State's business entity search before you sign.

Reviews, followers and the FTC

Some small agencies sell reputation packages to restaurants, hotels, clinics and contractors. Since 2024 the FTC's rule on consumer reviews and testimonials prohibits creating or buying fake reviews, offering incentives "conditioned on the writing of consumer reviews expressing a particular sentiment," suppressing negative reviews with threats or intimidation, and buying "fake indicators of social media influence, such as followers or views generated by a bot or hijacked account." The FTC can seek civil penalties against knowing violators. If an agency promises a set number of five-star reviews or followers, walk away. Asking every customer for an honest review, good or bad, is fine.

What it costs

Small agencies set their own prices, usually a monthly retainer or a project fee, and few publish them. Two public reference points help. First, local pay: agency offices here paid $64,611 per employee in 2023, so a full-time specialist's time costs the agency well under the national average. Second, federal price lists: on GSA schedule contracts, the national median ceiling rate is about $103 an hour for an account manager or executive, $133 for an art director, $134 for a copywriter and $143 for a PR specialist (our calculation from GSA's CALC+ data on 30 October 2026: each contractor's median for the role, then the median across contractors with advertising, consulting, PR or design contracts). Those are federal maximums, not Charleston quotes, but they show the range a fair hourly rate falls in.

Selling to Charleston agencies

Almost every buying decision here is the founder's. With 105 of 113 offices under ten people, there's no operations team to route around: write to the owner, keep it short and price in monthly terms. Don't ignore the 144 consultancies and 54 design studios; they buy the same scheduling, reporting, stock and freelance services.

Illustrative example. The vendor, price and conversion rate are invented.

Tidewater Dev (tidewater.example) does white-label website builds for agencies at a flat $4,500 per site. Its Charleston list: 37 advertising agencies, 54 design studios and the 144 consultancies, 235 businesses. Perhaps a quarter sell websites to their clients without an in-house developer, about 59. If an illustrative one in ten tries a first build within six months, that's about six agencies and, at two sites each a year, roughly $54,000. A short note to the founder, tied to a site the agency recently launched, opens the conversation.

Subject: The [client] site

Hi [first name],

The new [client] site looks great. When a three-person shop sells a build like that, the development usually lands on someone who'd rather be designing.

We build agency-designed sites under your name at a flat [price], with [proof, e.g. a two-week turnaround and a year of fixes included]. Your client never sees us.

Want our rate card for your next proposal?

[Your name]
[Company, postal address]
Reply "no" and I won't email again.

For the method, see how to build a prospect list.

Charleston sources

SEC EDGAR shows no listed company in the advertising codes (SIC 7310 to 7319) with a business address in the three counties.

Next step: for the national view and how larger agencies are organized, see the largest advertising agencies and how to build a list.