What exactly do marketing agencies do?
US marketing agencies package the execution of marketing work (strategy, creative, media, content, SEO, social, email, analytics) into services businesses buy instead of hiring in-house. Full-service agencies cover multiple disciplines under one roof; specialist agencies focus on one (SEO-only, paid-only, content-only). Most modern agencies also handle marketing technology setup and reporting. The unifying job is trading their expertise and capacity for your budget.
What the whole field sells, counted
Rather than describe the category, here is what US firms say they do. Across the 1,738 listings in The Wall that publish a service list, the five most frequently named services are search engine optimization (551); branding (505); web design (487); pay per click (459); advertising (374).
The field caps at 4 services per firm, so those counts are what firms lead with rather than everything they will take on. The ranking still holds: search, identity, site work and paid media are the four jobs most of this industry is built around.
Price is more uniform than the service names suggest. Across the whole index, 2,614 listings publish an hourly rate and 2,148 of them sit between $100 and $199, whichever of those four jobs the firm leads with. The variation that matters is in the minimum project size, which runs from $5,000+ at the common end up past $100,000.
How to use this
Match the firm's top-listed service to the job you are hiring for. A shop that leads with branding will take your paid search work and staff it second. The service list is the closest thing to a public statement of where their best people sit.
How this was computed. Every figure on this page is counted from The Wall's own directory of approved, US-headquartered, machine-verified-live listings: 3,460 of them in the snapshot captured 2026-09-14. Rates, minimum project sizes, team sizes, founding years and ratings are provider-declared figures published on public profiles. 1,738 of those listings publish a service list, and that field holds at most 4 services per firm, so service counts are counts of what firms name first rather than everything they sell. Percentages of disclosed values exclude listings that publish no figure. Nothing here is modeled or estimated. Sourcing standards: editorial policy.
Why this matters
Google puts this question in People Also Ask for the "marketing agency" query, which means buyers are asking it while they shop. The Wall answers it from the directory position: we index 3,460 verified US growth-services vendors across 10 pillars, so the figures above come from those records rather than from a survey.
If you are evaluating vendors in this category, the Marketing pillar page carries the full US firm list with rate, team size and headquarters filters.