I live in Parker and this company is registered here, so treat everything below accordingly. I have tried to write the guide I would want if I were the one hiring.
The useful part is not a list of names. It is knowing what to judge on, and there is one thing almost everybody judges on here that turns out to be close to worthless.
The Warning First, Because It Is the Expensive One
Parker is an easy market to rank in and a small market to sell in. Those two facts get confused constantly, and the confusion costs real money.
Here is my own account rather than a hypothetical. This site holds position 2.3 for website design pricing in Parker. Second on Google, for a bottom-of-funnel search by somebody with their wallet out.
That ranking produced 89 impressions in ninety days. Roughly one person a day sees it.

Nothing about that ranking is a lie. It is simply attached to a search almost nobody in a town of sixty thousand types.
So when an agency shows you a report full of first places in Parker, the question is not whether the rankings are real. It is how many people are behind them. That check takes an hour, needs nothing your agency holds, and it is the single most useful thing in this article. The full version is here.
What to Judge On Instead
Ask what you own in month eleven
An agency selling activity bills for hours, audits and reports. At the end of a year you own a stack of PDFs.
An agency building assets leaves you with pages that are indexed, a profile built out, and reviews on the record whether or not you renew. Both feel similar month to month. Only one is worth anything when the invoicing stops.
Ask for the rankings and the call log together
Any agency can produce a report full of green arrows. Very few will put it next to the client's Google Business Profile call count for the same period.
Ask for both. If there is reluctance, that is the answer.
Ask whose name the accounts are in
Domain, hosting, Google Business Profile, call tracking number. All should be registered to you from the first day, not held by the agency and released on request. Ask before you sign rather than after.
Ask for the number, and check it is on their site
If the price only appears after a sales call, it is being set by what you look like you can afford rather than by the work.
Mine are published: $1,500 to $6,500 for the build, then $750 to $1,500 a month if you want the search work with it.
The Three Kinds of Provider in Parker
The freelancer. Cheapest, often genuinely good at design, and the risk is not quality. It is what happens when they get a full-time job or take on too much. Ask what happens to your site if they disappear for a month.
The Denver agency with a Parker landing page. Real capability and real teams. The trade-off is that you are a small account, the person who sold you is not the person building it, and the standard agreement is twelve months signed before anyone lifts a finger.
The local specialist. Fewer clients, the same person throughout, and a narrower range of what they can do. If you need a national campaign or e-commerce at scale, this is the wrong shelf.
None of the three is correct. Which one fits depends on whether your bottleneck is design, volume of work, or search.
Where I Fit, and Where I Do Not
I am a good fit if you want the site and the search work run as one thing, you want the price before the call, and you would rather have a small number of pages that rank than a large retainer.
I am the wrong fit for e-commerce at scale, national campaigns, or anything needing a large team. If that is you I will usually know somebody worth talking to, and I would rather say so early.
And If You Are Actually Selling Outside Parker
This is the part I would want said to me.
Parker is where I am based, and it is not where the searches are. Castle Rock is a thicker market than Parker for most trades, and the Denver metro is bigger again by an order of magnitude while being far harder to rank in.
If your trucks already drive to Castle Rock, Lone Tree or Highlands Ranch, the honest advice is to build for those towns as well rather than optimise harder for the one your office sits in. A page per town you genuinely serve is worth more than a first place at home.