303 area code
303 Area Code– Get Local Phone Number For Denver, Colorado
Start using your 303 area code business phone number in a few minutes with KrispCall. This area code allows people in Denver and the surrounding areas to see your business. KrispCall’s technology increases visibility, builds trust, and facilitates customer engagement.
9000+ companies worldwide trust and cherish our service
Where is 303 area code?
The 303 area code is located in central Colorado, US. It touches 17 counties, including Adams, Arapahoe, Clear Creek, and Broomfield, and also includes major cities like Denver, Boulder, Lakewood, Littleton, Broomfield, Castlerock, etc.
Area code 303 was implemented in 1947 AD as one of the earliest area codes. In 1988 and 1995 AD, it was split by 719 and 970 area codes, respectively. In 1998 and 2022 AD, It was overlaid by 720 and 983 area codes, respectively. With a population of 3,251,127, it is one of Colorado’s most densely populated areas.
Some nearby area codes are 719 (Colorado Springs, Colorado), 970 (Fort Collins, Colorado), 983 (Denver, Colorado), etc.
| Country | USA |
| State | Colorado |
| Major City | Denver, Boulder |
| Time Zone | Mountain Time Zone (UTC-7:00) |
| Telephone Number Format | +1 (303) XXX-XXXX |
| 303 Area Code Phone Number Example | +1-303-123-4324 |
| Zip Code | 80001 – 80643 |
How does a 303 business phone number work?
A 303 business phone number works like any other phone number in the United States. Area code 303 is part of the North American Numbering Plan (NANP). To place a call, callers must dial a 10-digit number including the area code.
For Example, to call 321 4324, dial +1-303-321-4324, where +1 is the country code for the USA. The 303 is the area code that routes calls to the specific region, and 321 is an exchange code that forwards calls to the specific service provider. The final 4324 is the subscriber number identifying the business or individual dialed.
With every KrispCall pricing plan, you can have a local number with the 303 area code, serving as a direct phone line. These numbers come with advanced features like call transfer, and number sharing, porting, IVR, text messages (SMS), multimedia messages (MMS), call blocking, call forwarding, and more.
KrispCall’s basic plan starts at just $15/user/month, making it affordable even for small businesses.
Who’s doing Business in the 303 Area Code?
Businesses with a 303 area code are diverse because this area code encompasses a vast region in north central Colorado. Whether you want to establish a customer base or connect with suppliers, multiple businesses operate in this area, from tech companies to healthcare, finance, and banking. From local businesses to large 303 area codes, it has it all.
Many popular businesses have established a strong local presence in area code 303, contributing to creating job opportunities for Colorado residents.
Some prominent sectors in area code 303 include:
- Educational Institutions: University of Colorado Boulder, National Renewable Energy Laboratory
- Technology: Ibotta, Ping Identity, SendGrid
- HealthCare: DaVita Inc., Biodesix
- Bank and Finance: Charles Schwab, Liberty Media
How to get a 303 phone number?
Getting a 303 area code phone number is simple with KrispCall. Sign up for the account, select USA, select a number with the 303 area code, make payment, and activate the number to start making and receiving calls and texts.
- Create a KrispCall account and log in to your dashboard.
- Go to Settings, click on My Numbers, and hit the + Add New Number.
- Select the United States of America (USA) in the Select Country field.
- Choose Colorado or click on the Advanced Filter, enter “303” in the Number box, select the first part of the Number in the Match to section, and click Search Numbers.
- Pick a phone number, click Buy Number, and confirm your purchase.
What are the benefits of using KrispCall’s 303 phone number for your business?
Create a Local Presence in Denver and nearby areas
Give your Business more Professional and Scam-free Looks
Separate Work and Personal Number
Powerful Standard PBX Features
No Additional Tools Needed
Increase your Approval Rate and Enhance your Sales
Enjoy powerful VoIP features with local phone numbers
Shared Number
Boost customer response by sharing your number with your team members and eliminating missed calls.
Unified Callbox
Get every detail of calls, SMS, MMS, and voicemails in a single window and access all conversations without switching apps.
Power Dialer
Manage a large volume of outbound calls by automating call dialing and improving agent efficiency & sales performance.
Auto Reply for Missed Call
Enhance caller experience by sending replies for their missed calls. Prompt them on how to reach your business even when you're unavailable.
Voicemail Greeting
Record customized, professional, and creative voicemail greetings to greet callers with automated voice messages.
Simultaneous Ringing
Use simultaneous ringing to ring multiple agents at once and ensure swift call answering & consistent customer interactions.
Bulk SMS
Convey a message to a large audience in one go. Reach your audience with important announcements instantly and efficiently.
Call Recording
Record phone calls to document the details shared in past conversations and deliver exactly what clients want.
Live Call Monitoring
Monitor live calls to ensure quality standards and gain real-time insights that drive performance and customer satisfaction.
Get a 303 phone number at an affordable cost.
Obtain a cloud-based communication platform with a local area code number with KrispCall, it offers three affordable pricing plans:
Essential |
Standard |
Enterprise |
|
|---|---|---|---|
|
Price |
$15 Per user per month | $40 Per user per month | Custom |
|
Users Limit |
5 | Unlimited | Unlimited |
|
Virtual number |
Includes 1 local virtual phone number per user | Includes 1 local virtual phone number per user | Includes 1 local virtual phone number per user |
|
Additional US numbers |
-Local number ($4) -Toll-free number ($5) |
-Local number ($4) -Toll-free number ($5) |
-Local number ($4) -Toll-free number ($5) |
|
Bundle Calling and SMS rate |
Pay per Minute Calling | Pay per Minute Calling | Pay per Minute Calling |
|
Messaging (US) |
Pay per Segment | Pay per Segment | Pay per Segment |
|
Number Porting |
 |
|
|
|
Call Forwarding |
|
|
|
|
Global Phone Numbers |
|
|
|
Proud to be Recognized as VoIP Leader & Regional Leader in ANZ, EMEA, Europe, and Asia Pacific by G2
J C.
HR Officer
Jun 23, 2025
“I love how easy KrispCall is to use, and the helpful support makes it easy for me to manage multiple numbers and stay connected globally.”
Mike B.
Co-Founder and Business Dev...
Jun 04, 2025
“KrispCall won us over with lightning-fast support, effortless access to numbers and SMS, and pricing that makes sense for small businesses.”
Tkachenko E.
Software Developer
Apr 21, 2025
“KrispCall lets me manage all my calls, texts, and voicemails from one place, helping me stay organized and present a professional image wherever I work.”
Amanda C.
CEO
Jan 22, 2025
“KrispCall’s quick, respectful customer support helped me find the perfect solution for global calls and a customer service number!”
Nagendra V.
Digital Marketing Specialist
Oct 07, 2024
“KrispCall makes global calling effortless with all the tools I need in one place—perfect for connecting with clients worldwide & my digital marketing needs!”
James S.
Software Engineer
May 21, 2025
“KrispCall’s easy setup and intuitive interface keep my team’s communication organized, while its AI-powered platform has streamlined global calls and customer interactions.”
Taha Ryuko S.
Founder & CEO
May 29, 2025
“We received a prompt response right after reaching out, and KrispCall helped resolve my virtual identity issue.”
Colin L.
Server
Feb 11, 2025
“We use KrispCall for a Hong Kong number to receive OTPs—the service is reliable, support is excellent, and the daily usage emails keep us in the loop.”
Lucas W.
Product Manager
Dec 3, 2024
"KrispCall’s authentic, professional service and exceptional customer understanding make staying connected with clients effortless—I’m very happy with it!"
Pushkar Verma
Director
Aug 12, 2024
“The setup process was very easy, with chat support available during our business hours. We needed a UK number with WhatsApp setup, and this solution met our needs at a reasonable price.”
Turan B.
Researcher
Jun 05, 2025
“KrispCall helped me get a virtual number that makes international calling smooth and easy.”
Sandeep M.
Real Estate Specialist
Apr 22, 2025
“KrispCall helped me get a UK number and set up WhatsApp and Telegram effortlessly for my real estate client calls from Dubai.”
Teddy M.
Finance Professional - Busin...
Feb 04, 2025
“Super quick setup and amazing support, KrispCall made it easy for our customers to reach us!”
Hunter F.
Business Analyst
Nov 12, 2024
"KrispCall’s amazing VoIP features and seamless number porting have been essential for managing my international business calls and remote team—highly recommended!"
Matthew Jones (JP, AFIML)
Associate Fellow
Jul 18, 2024
“Been using KrispCall for a while now and the service is great and the customer support is so responsive”
Nearby Area Codes
Frequently Asked Questions
303 area code is the telephone area code coming from central Colorado, including Denver, CO, the largest city in the region with more than 3 million population. It serves cities like Boulder, Lakewood, Littleton, Broomfield, Castlerock
The area code 303 comes from the state of Colorado and covers the Adams, Arapahoe, Broomfield, Boulder, Clear Creek, Douglas, Elbert, Gilpin, Jefferson, and Weld counties.
Cities like Denver, Boulder, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial, Golden, Broomfield, etc, which covers central Colorado have a 303 area code.
303 area code comes from the state of Colorado in the United States and covers the central part of the state, covering Boulder, Adams counties.
303 area code is located in the Mountain Time Zone which is 7 hours behind Coordinated Universal Time during Standard Time, and 6 hours behind during Daylight Standard Time.
303 area code was started in the year 1947 AD as one of the original North American area codes, and originally served the entire state of Colorado.
303 area codes range from 80001 to 80643. The Colorado 303 area code has different zip codes for each city. The area code for Arvada (Jefferson County) is 80001.
The 303 area code is not always associated with scams or frauds. However, sometimes scammers can use the 303 phone area code phone numbers to attempt to steal your data or money.
Obtain the Virtual 303 Phone Number now
Virtual Cloud Phone Solutions for Businesses and Remote Teams
KrispCall for Multiple Platforms
Stay connected no matter where you are. KrispCall is your constant companion, available on iOS, Android, as a WebApp, and Google Chrome Extension.
