How do you find a good content marketing agency?
Ask to see recent published work in your industry (actual articles that are ranking or generating leads, not case-study slides). Ask who will do the writing (in-house team, freelancers, offshore, AI-augmented). Ask what happens in month 4 when the initial content wave is out but rankings haven't kicked in yet. If they answer clearly, they're probably good.
Which signals separate them and which do not
Start by discarding the signal most buyers lead with. 331 of the 360 US firms listing content marketing carry public client reviews, 5,307 of them, at a mean of 4.9 out of 5. Nearly the whole field scores near the top, so the score cannot rank anything.
The separating fields are structural. 37 price under $100 an hour and 44 price above $200. 304 run fewer than 50 people. The median founding year is 2012, so a firm founded in the last two years is a genuine outlier in this group.
Minimums do useful screening work before any call happens. 220 of the 340 firms that publish one open at $5,000 or less and 44 require $25,000 or more. Filtering on that first removes most of the meetings that were never going to end in a contract.
How to use this
Screen on rate band, team size and years in business, then judge the shortlist on published work in your category. Ask who writes and whether that person is on the pitch call. In content, the answer to that one question predicts most of the outcome.
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 "content 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 Content Marketing pillar page carries the full US firm list with rate, team size and headquarters filters.