First things first. You need your Colorado EMT, IV certification, and CO driver's license before anyone is going to read your application. I have never taken an EKG class and have worked at a few places. Same with PHTLS.
As to actual employment...
Denver has a multitude of private companies that will hire no experience EMTs. Some are better than others, some put you on the wheelchair van first, some straight on an ambulance. With you will start on a van as an EMT almost assuredly with the same going for AMR Colorado Springs and sometimes Denver. Denver Health runs dual paramedic ambulances and does the majority of 911 in the city and county of Denver.
Colorado Springs/El Paso County 911 is AMR. Some fire districts do their own EMS, one (Security-Widefield) contracts to a Denver private (Action Care). There's a transfer service (Rocky Mountain) that does the Air Force Academy and Schriever AFB. They have a poor reputation.
Pueblo/Pueblo and Fremont Counties 911 is AMR.
Boulder/Boulder County is mostly AMR. Difficult to get into without AMR contacts.
Fort Collins/Larimer County is mostly Poudre Valley/UC Health. Also difficult to get on as an EMT.
Here's a list of Colorado EMS employers that I have explored in the past:
Ute Pass Regional Ambulance
Woodland Park and Teller/Park/Douglas/El Paso Counties
15FT plus PT medics and EMTs, P/B ambulances with 2 in Woodland Park, 1 in Florissant
Southwest Teller Health District EMS
Cripple Creek
2 P/B ambulances, 24s, out of Cripple Creek Fire Station
Hires PT EMTs and Medics
South Park Ambulance District
Fairplay and most of Park County
2 Double medic ambulances, 48s
Only hires medics, does hire PT
Grand County EMS
All of GC
4 stations, P/B ambulances, 48s
Northglenn Ambulance
Based north of Denver, IFTs all over
911 for South Adams County/Commerce City
P/B ambulances in fire stations (some)
Good rep from EMTLife
AMR COS
Colorado Springs Fire 911 contract, possibly El Paso County (out to bid)
Half P/B half double medic cars, mostly 12s, SSM. A few 24s from hard stations (medics only)
Must start fulltime
AMR Boulder
Good rep, apparently hard to get on as an external applicant.
AMR Pueblo/Canon City
Pueblo and Canon City, all of Pueblo county, parts of Fremont
P/B ambulances on mostly 12s, one 24 out of Pueblo West fire
Fremont County Ops might do 24s
Part time Fremont County must live in county
Chaffee County EMS
All of Chaffee County
2 P/B ambulances on 48s, one in Salida, one in Buena Vista
Hires PT
Eagle County Paramedic Services
All of Eagle County
4? ALS ambulances throughout county
Hires seasonally and PT
Summit County Ambulance
All of Summit County
4? ALS ambulances throughout (P/P or P/I)
Hires seasonally and PT, almost only medics
Not hiring
Clear Creek County EMS
All of CC County
2 P/B ambulances on 24s, one in Idaho Springs, one in Georgetown, office in Dumont
Hires PT medics and EMTs
Contact county HR for openings or facebook
Gilpin Ambulance Authority
Gilpin County area
3 P/B ambulances on 48s, 2 in Black Hawk, one in northern county
Hires PT medics and EMTs
Offers fire training but is single role
Craig Hospital
Craig and Moffat County area
2 ALS ambulances out of the hospital
Estes Park Hospital
2 ALS ambulances out of hospital, more during summer
Hires PT/Seasonal
Leadville Hospital
1 ALS ambulance on 24s, plus backup (call in crews)
Poudre Valley/ UCH Ambulance
Fort Collins/Larimer County area
P/B ambulances on mostly 12s
Hires EMTs for reserve spots then promotes
Hires medics straight on?
Good rep from EMTLife
Pagosa Springs EMS/ Upper San Juan Health Services District
Pagosa Springs area (west of Wolf Creek Pass/Hwy160)
2? P/B ambulances on 48s, both in Pagosa Springs?
Hires PT EMTs and Medics
Affiliated with hospital
Platte Valley Ambulance
Brighton area (NE Adams County)
4 P/B ambulances on 24s, Hospital based but has more than one station?
Excellent rep from all over
Director: Carl Craigle
Gunnison Valley Hospital EMS
Covers all of Gunnison County except Crested Butte
P/B Ambulances
Hires PT EMTs and Medics
Crested Butte FPD Ambulance
Crested Butte area
Hires non-fire medics to staff ambulance
Thompson Valley EMS
Loveland/Berthoud area and West
P/B 10 ambulances out of 5 stations on 24s or 12s?
Hires PT EMTs, need two years 911 experience
Hires PT medics
Hiring Contact: Marvi Delgener, HR
Aspen Ambulance District
Aspen and some of Pitkin County
3? ALS ambulances on 24s in fire stations
Season Staffing
Alamasoa Ambulance/ San Luis Valley Medical Center
Most/all of Alamosa County
2 P/B ambulances on 24s or 48s
Hospital Based
Good reputation, little info:
Delta County Ambulance, Trinidad Ambulance District
Nice areas but fire based ALS: Steamboat, Montrose, Glenwood Springs, Durango, Carbondale, Snowmass, Basalt Rural FPD (near Aspen)
Hope this helps.
Edited to remove contacts: PM if you need them.