6 Best SEO Companies in Denver (2026)

Colorado has 730,887 small businesses, 99.5% of all firms in the state, and together they employ 48.6% of the state’s employees, according to the SBA Office of Advocacy. Plenty of Denver agencies sell search optimization to them, but when we traced addresses, several familiar names turned out to work from a shipping-store mailbox, a coworking membership or no office at all. The six below have Denver-area offices we could confirm, from the Denver Tech Center and the Wells Fargo Center downtown to East Speer Boulevard, Tennyson Street and Glendale, and they range from two SEO-first local shops to a web and security firm, a Shopify specialist, a 120-person performance agency and a franchise marketing firm.

At a glance

#NameReader votes
01 Firestarter SEO 0
02 Epidemic Marketing 0
03 Fruition 0
04 Booyah Advertising 0
05 BLKDG 0
06 Location3 0

Firestarter SEO

★ Top pick
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Firestarter SEO, founded in 2009, has its office in Suite 460 of Denver Corporate Center I on South Syracuse Street in the Denver Tech Center, and its menu is almost all search: local and technical SEO, on-site work, content, link building and schema markup, AI-search optimization built on its SOURCE framework, and Google Ads and Local Services Ads management. Law firms, medical and dental practices, med spas, financial services and home services top its industry list, it claims more than 300 clients with businesses in six states from Colorado to Florida and the Carolinas, and Clutch named it a top SEO company for both Denver and Colorado in 2026. Best for: law firms, clinics and other local practices that want an SEO-first firm with a long Denver track record.

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Epidemic Marketing

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Epidemic Marketing has offered SEO in Denver since 2009 from Suite 12 of a building on East Speer Boulevard, and it is unusually open about cost: SEO packages start at $2,499 a month and audits at about $1,000. Senior SEO lead Noah Lopata writes much of its published advice, the firm also builds websites, runs Google Local Services Ads and handles conversion work, and its typical clients are trades and practices such as HVAC contractors, plumbers, tree services, restaurants, dentists and personal injury lawyers; UpCity named it a Best of Colorado winner in 2022. Best for: HVAC, plumbing and other trade businesses that want to see a monthly price before the first call.

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Fruition

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Fruition began as an SEO shop, dates to 2003 according to its own site and was founded by Brad Anderson; it works from an office on East Speer Boulevard. Its motto, Build. Grow. Protect., describes a mix of website builds, SEO and AI-search work, paid media and content, plus secure hosting, and the site launches it highlights include Denver International Airport, San Diego International Airport, the Butterfly Pavilion, Project C.U.R.E. and the Wyoming Judicial Branch. Best for: public agencies and larger organizations that want search, the website and its security handled by one team.

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Booyah Advertising

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Booyah Advertising, founded in 2001, is the largest firm here, with more than 120 people on the 46th floor of the Wells Fargo Center on Lincoln Street and more than $140 million under management. SEO, GEO and content form an organic practice beside paid search, paid social, programmatic, and Amazon and retail media, and Visit Denver, Stio, Dermalogica, Murad and Boyne Resorts are among the brand logos it displays. Best for: consumer, travel and retail brands that want organic search planned alongside a large paid media budget.

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BLKDG

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BLKDG has worked out of Denver since 2011 and keeps its office on Tennyson Street in the Berkeley neighborhood of northwest Denver, pairing SEO with Shopify, WordPress and custom site builds, paid media, email automation, conversion work and revenue reporting. It holds partner badges from Shopify Plus, Klaviyo, Google, HubSpot and Recharge, and its client list leans toward drinks and outdoor gear, with Sierra Nevada Brewing, Abita, Lawson’s Finest Liquids and 4FRNT among the names. Best for: craft beverage and outdoor brands selling direct to consumers on Shopify.

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Location3

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Location3 has marketed franchise and multi-unit brands since 1999 and works from Suite 462-S on South Colorado Boulevard in Glendale, the enclave city surrounded by Denver. Its LOCALACT platform ties local listings, reviews, SEO and paid media together with a daily view of each location’s search visibility, gained a LocalScore performance rating in February 2026, and offers franchisees a local content and SEO program; a July 2026 company presentation counts more than 70 multi-location brands and 34,000 activated locations. Best for: franchisors and multi-location chains that need search managed location by location.

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Bottom line

Start with the kind of business you run. Local practices and trades get the most focused attention from Firestarter SEO and Epidemic Marketing, the two firms here built almost entirely around search; Fruition suits organizations that want SEO, the website and its hosting under one contract; Booyah fits brands with large paid budgets; BLKDG is the pick for Shopify stores; and Location3 is built for franchise systems. On timing, Google’s SEO Starter Guide notes that some changes might take effect in a few hours while others could take several months, so ask for a timeline with milestones rather than a single launch date.

Do FAQ snippets and other rich results still help SEO?

Fewer of them exist. Google limited FAQ rich results to well-known, authoritative government and health websites in August 2023, dropped how-to rich results that September, and stopped showing FAQ rich results in search altogether starting May 7, 2026; during 2025 it also retired structured data features including course info, estimated salary, learning video, special announcement and vehicle listing. Markup for features Google still supports remains worthwhile, but a plan built around results Google no longer displays will not deliver what it promises.

Who should control your Search Console and Google Analytics accounts?

You should. In Google Search Console, a verified owner has full control of a property and can add or remove other people, while an agency can do its work as a full user, which has view rights to all data and can take some actions; if every verified owner is removed, everyone else loses access after a grace period. In Google Analytics 4, only an Administrator can add or remove users, so keep that role inside your company and give the agency Editor or Marketer access instead.

Do Colorado web pages and ads have to show the full price?

Yes, since January 1, 2026. House Bill 25-1090, signed in April 2025, requires sellers that advertise or display a price to show the total price, meaning the maximum total of all amounts including fees and charges, as a single number that is more prominent than other pricing information; government charges such as taxes, and shipping costs, can be left out. A violation counts as a deceptive, unfair and unconscionable trade practice under the Colorado Consumer Protection Act, so pricing and landing pages your agency writes should state all-in totals.

How our rankings are made

Reader votes

One vote per reader per tool, bot-filtered. Votes decide the order — the most-voted tool is #1, shown as real numbers.

Verified use

Reviews are weighed by evidence of real use by US businesses — not by volume.

Editorial analysis

We test the tools, read the pricing fine print, and write the reviews. Your votes set the ranking.

No vendor pays for placement.