Find the relevant public guidance.
DHSEM’s official preparedness bulletin links a Local Colorado Emergency Managers and Alerts directory and encourages readers to use several information sources, including local emergency services and alert systems.
Colorado / Community directory
Colorado.
Start with the right source.
Explore Colorado places in our directory. Check the responsible agency and confirm participation before expecting updates or a reporting feature in Lucas.
Participation not confirmed.These 28 places come from a population-based inventory. Their presence does not imply an agency partnership, Lucas coverage, or an available tip channel.
Colorado / Official source notes
Useful places to begin.
Check the service and the area it covers.
The same agency bulletin links Colorado Hazard Information and Be Prepared resources in ASL and multiple written languages, giving readers an accessible-materials route alongside local alert registration.
These links describe independent public services and preparedness information. Read the original page for current enrollment, local boundaries and instructions. They do not establish Lucas participation.
The cited DHSEM bulletin documents these resources. Some linked destinations were unavailable during review; use the current agency or the USA.gov directory to continue the search.
What this Colorado inventory includes.
There are 28 qualifying place records in this state inventory. Denver (740,613), Colorado Springs (494,743), Aurora (410,053) are the largest included places. These are Census place estimates for 2025, not current counts of users, warnings or participating agencies.
15 included places have fewer than 100,000 residents; 13 have 100,000 or more. The smallest included record is Fountain at 29,450. The table is alphabetical, so those population differences do not determine which place appears first.
Every row uses the same inclusion threshold of at least 25,000 residents. A smaller town, unincorporated area or omitted census-designated place can still have official services and warnings. A missing name here is a limit of this research inventory, not evidence that a community lacks a reporting or alert service. Read the Census population source.
Use the directory for the task you have.
For local updates, identify the city, county or other authority responsible for the place that matters to you. Follow its current warning-registration instructions where offered. A person’s home, workplace and family can connect them to different jurisdictions, and each provider can have its own enrollment process.
For a police report, begin with the agency’s official reporting information. A place name in a population table does not identify which self-service reports are eligible or which office should receive evidence. For a product question, use Detailr’s business contact instead of an emergency or police reporting route.
Official state information
Keep your official warning channels.
State emergency management resources provide preparedness guidance and links to current public information. Local warning subscriptions and reporting instructions should be checked with the responsible authority.
Colorado Division of Homeland Security and Emergency Management ↗Official state agency information. External resources are independent of Lucas and Sentinel. Reviewed October 26, 2026.
Explore the directory.
28 places · population reference year 2025
28places in this state inventory
25,000+resident inclusion threshold
2025Census estimate vintage
Find the source for your part of Colorado.
The inventory is a way to begin a local information search, not a substitute for the agency responsible for an address. Start with your city or county’s official website, identify its police service provider, and check its current warning subscriptions and reporting instructions. A municipal name does not always identify a separate police department.
Among the larger places in this inventory are Denver, Colorado Springs, Aurora, Fort Collins, Lakewood. These names and estimates come from the Census source linked below. Population describes a place; it does not establish the number of app users, participating departments or people receiving alerts.
Choose the channel for the task.
State emergency management resources are a useful starting point for preparedness and official information. A local police agency’s reporting page answers a different question: which incidents it accepts, which recipient is appropriate and whether a self-service route fits the circumstances. Check those eligibility instructions before sending personal information or evidence.
If you need information for several places, keep their sources distinguishable. Home, work and family may connect you to different authorities. Following a participating agency in Lucas is separate from subscribing to official warnings, and a directory entry does not confirm that a department publishes in Lucas or accepts Lucas tips.
Read the inventory with its limits in view.
The table uses a population threshold to keep a national research inventory manageable. It is not a complete list of neighborhoods, unincorporated communities or all census-designated places. A missing place may still have official services and warnings. Use the relevant city, county or state source to continue the search rather than treating absence here as evidence that a service is unavailable.
For a researched local page, follow the original official links and look for the latest instruction. For a department considering Sentinel, begin with a discussion of the actual workflow and operating responsibilities. Information-finding, product evaluation and emergency assistance are distinct tasks; this directory is for the first of those.
Search a city or state. Participation must be confirmed with the agency.
The place table scrolls horizontally on narrow screens. Focus the table area to scroll with the keyboard.
| Place | Population reference | Lucas participation |
|---|---|---|
| Arvada | 122,901 | Not confirmed |
| Aurora | 410,053 | Not confirmed |
| Boulder | 105,689 | Not confirmed |
| Brighton | 45,395 | Not confirmed |
| Broomfield | 79,174 | Not confirmed |
| Castle Rock | 83,815 | Not confirmed |
| Centennial | 108,658 | Not confirmed |
| Colorado Springs | 494,743 | Not confirmed |
| Commerce City | 72,345 | Not confirmed |
| Denver | 740,613 | Not confirmed |
| Englewood | 35,305 | Not confirmed |
| Erie | 40,904 | Not confirmed |
| Fort Collins | 171,500 | Not confirmed |
| Fountain | 29,450 | Not confirmed |
| Grand Junction | 71,827 | Not confirmed |
| Greeley | 115,073 | Not confirmed |
| Lafayette | 30,116 | Not confirmed |
| Lakewood | 156,927 | Not confirmed |
| Littleton | 46,246 | Not confirmed |
| Longmont | 100,109 | Not confirmed |
| Loveland | 81,387 | Not confirmed |
| Northglenn | 38,893 | Not confirmed |
| Parker | 65,985 | Not confirmed |
| Pueblo | 110,404 | Not confirmed |
| Thornton | 147,766 | Not confirmed |
| Westminster | 116,182 | Not confirmed |
| Wheat Ridge | 32,081 | Not confirmed |
| Windsor | 43,840 | Not confirmed |
Source: U.S. Census Bureau Vintage 2025 population estimates. The directory uses the source’s place records with at least 25,000 residents. Population figures are estimates for places, not product adoption. Other census-designated places and unincorporated communities may be absent. Participation status reviewed October 26, 2026.
For residents
Use official local information to find the responsible agency and its current warning or reporting channels. Lucas is designed for following participating departments; a directory record is not confirmation.
For departments
Interested in evaluating the resident and agency workflow? Our team can discuss current capabilities, department requirements, and a limited evaluation.