
State Farm® Insurance Agent Greg Kostuk
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Our customers are the center of our universe and we’re grateful for them. If you’re willing to share your experience about your interaction with our agency, it’ll be a great help for other people looking to make smart and confident decisions about their insurance and financial services.
Take 60 seconds (or more if you want) to share your story by clicking on one of the review links below.
What our customers say about us...
Christine Hunter
October 16, 2025
"Justin made this so easy!!! Thank you"
"We're so glad to hear Justin made everything easy for you! Thank you for your kind words. - Greg Kostuk Insurance Agency"
Dana H
October 15, 2025
"Great experience working with Justin! Found all the ways to get me the best rate and best coverage on my new home purchase!"
"We're thrilled to hear about your great experience with Justin! Helping you secure the best rate and coverage is our top priority. Congratulations on your new home! - Greg Kostuk Insurance Agency"
Virgilio Balmori
October 9, 2025
"Amber Cantu did a great job! She was professional, friendly, and made the whole experience smooth from start to finish. Her customer service skills are excellent — she really takes the time to listen and make sure everything is done right. Highly recommend working with her!"
"We’re happy to hear Amber’s customer service made a positive difference from start to finish. Thanks for sharing your great experience! - Greg Kostuk Insurance Agency"
WalkerParker
October 9, 2025
"Jacob Turbett, along with the entire Kostuk office, has been nothing short of incredible to work with. They are all so kind and work really well as a team. Jacob has went above and beyond in getting our new policies setup, with the best customer care we have experienced. Thank you guys!"
"Thanks so much! It’s great to hear Jacob went above and beyond and that the whole team made a positive impact. We truly appreciate your kind words! - Greg Kostuk Insurance Agency"
Mao Lachis
October 9, 2025
"I mean Jacob was the most helpful agent I could have asked for, he answered all my questions and made everything understandable. Thank you again."
"Thank you for your kind words! We’re glad Jacob was able to answer all your questions and make everything clear. We appreciate your trust! - Greg Kostuk Insurance Agency"
Bryan Applegate
October 8, 2025
"Zack was very helpful and thorough. I would highly recommend working with him."
"Thank you for your kind words! We’re glad Zack provided helpful and thorough service. We appreciate your recommendation! - Greg Kostuk Insurance Agency"
Tori Carlson
October 7, 2025
"Greg was the most helpful agent. Truly wanted to help get me everything I needed and answered all of my questions and then some ."
"Thank you for your kind words! We’re glad you received thorough and helpful service. We appreciate your trust! - Greg Kostuk Insurance Agency"
kristie Hays
October 6, 2025
"Justin was fantastic to work with! Very easy to get quotes from and very knowledgeable!"
"Thank you for your kind words! We’re glad Justin made the process easy and provided knowledgeable service. We appreciate your support! - Greg Kostuk Insurance Agency"
Christy Smith
October 6, 2025
"Greg has connected personally even when I didnt purchase insurance. I actually saved his contact. He was very straight forward. I plan on going with the life insurance. He explained everything!"
"Thank you for your kind words! We’re glad we could provide clear and straightforward information, and we look forward to assisting you with your life insurance needs. - Greg Kostuk Insurance Agency"
diana harder
October 3, 2025
"David Harder and myself Diana Harder have been real estate broker for 30 years in the Littleton and Denver area. We are very pleased with Justin Miller from State Farm and the services he recently provided to our clients! His knowledge and listening skills and guidance for what we needed for our clients need was exceptional! We highly recommend Justin Miller, and this State Farm agency!"
"We’re grateful for your positive feedback! It means a lot that Justin’s knowledge and attentiveness have made a difference for you and your clients. Thank you for recommending our State Farm agency! - Greg Kostuk Insurance Agency"
Hannah Harder
October 3, 2025
"I am Hannah’s mother… using her account her for review. My husband and I David Harder have been very fortunate to refer our clients to Justin Miller! We are real estate brokers with 30 years experience. We are very protective of our clients. We were very impressed and pleased with Justin’s knowledge and his good listening skills and taking care of our clients! We highly recommend Justin Miller and State Farm if you were looking for automobile, life or homeowners insurance! -David and Diana Harder Littleton, Co."
"Thank you for your thoughtful recommendation! We’re honored that you and your husband trust Justin to take care of your clients. We appreciate your support and look forward to serving you and your referrals! - Greg Kostuk Insurance Agency"
James Sheehan
October 1, 2025
"Worked with Jacob today to setup insurance for a secondary car that was in an accident that I wanted to put back on the road. Jacob worked with me and took into consideration the policy I was looking to get and lined things up perfectly. He took additional time to educate me on the different policies and what I should sign up for to be safe and protected while also not breaking the bank. All in all, I feel I settled on a policy that made sense to me. I can't thank Jacob and the State Farm office enough for the continued care they provide on every call. Thanks Jacob!"
"Thank you for your detailed and positive review! We’re delighted to hear that Matt at Greg Kostuk Insurance Agency assisted you seamlessly in transitioning your insurance from New York to Colorado for your new car. It’s gratifying that he collaborated with you to customize a policy that met your needs at a fair rate, while thoroughly addressing all your questions to ensure your confidence in the decision. We’re proud that Matt had you fully insured in just two phone calls while going above and beyond to assist in matters beyond his immediate responsibility. This reflects both his character and the values of our State Farm office. We deeply appreciate your trust and recommendation for your auto insurance needs—thank you for choosing us, and a special thanks to Matt for his outstanding service! -Greg Kostuk Insurance Agency "
Jingsi He
September 29, 2025
"With the great help from Justin Miller, I got my auto insurance and renter insurance arranged in a prompt manner. It was a short notice with quite some changes, but Justin managed to get it done for me. Thanks!"
"Thank you for your kind words! We’re glad Justin could assist you promptly and handle the changes smoothly. We appreciate your trust! - Greg Kostuk Insurance Agency"
Aaron Hills
September 25, 2025
"Great customer service and great insurance at a affordable price."
"Thank you for your kind words! We’re glad you’re happy with our service and affordable insurance options. - Greg Kostuk Insurance Agency"
Elisa Lopez
September 24, 2025
"Justin and Landon were awesome!!! Exceptional customer service!!! They both were so efficient, helpful and listened to my needs."
"We’re happy to hear Justin and Landon listened carefully and delivered exceptional customer service. Thanks for sharing your experience! - Greg Kostuk Insurance Agency"
Colton McGrew
September 24, 2025
"Caleb did a great job. He patiently explained all the different coverages"
"Thank you for your feedback! We’re glad Caleb took the time to patiently explain all the coverage options for you. - Greg Kostuk Insurance Agency"
Sean
September 24, 2025
"Justin got back to me quickly and helped me add another motorcycle to my policy. The staff is always friendly and helpful when I call. I recommend this office!"
"Thank you for your kind words! We’re glad Justin could assist you quickly and that our team consistently provides friendly, helpful service. We truly appreciate your recommendation! - Greg Kostuk Insurance Agency"
Steve Simpson
September 23, 2025
"I’ve known Mike Sena for a long time. He was attentive, clear, and honest. Just what you want from an insurance associate."
"Thank you for your kind words! We’re glad Mike has consistently provided attentive and honest service. We appreciate your continued trust! - Greg Kostuk Insurance Agency"
john burk
September 22, 2025
"Maddie Saito provided excellent customer service, and helped the purchase of my new home go smoothly. She saved me time and effort by dealing directly with both my lender and builder, and always responding quickly to any questions or changes. I had a very positive experience with Maddie and State Farm."
"Thank you for your kind words! We’re glad Maddie could help make your home purchase smooth and stress-free. We appreciate your trust in State Farm! - Greg Kostuk Insurance Agency"
Catie Kean
September 18, 2025
"Justin was great! He made getting insurance fast and easy."
"Thank you for your feedback! We’re glad Justin made the insurance process quick and easy for you. - Greg Kostuk Insurance Agency"
Raymond Cenname
September 17, 2025
"Excellent customer serves through out the whole process"
"We appreciate your feedback! Providing great service from start to finish is our priority, and we’re happy you had a positive experience. - Greg Kostuk Insurance Agency"
Judy Hoffman
September 16, 2025
"My experience with Justin Miller with State Farm has been great! He is informative, friendly and very helpful with explanations of the variety of their policies. I highly recommend Justin and State Farm."
"Thank you for your kind words! We’re glad Justin could provide helpful and friendly service. We appreciate your recommendation and look forward to assisting you in the future! - Greg Kostuk Insurance Agency"
Monique Hyche
September 12, 2025
"Let me tell you about this insurance company they are amazing my agent Claudia goes above and beyond for her clients. Manament is awesome great environment good quotes. Thanks guys for being there for me"
" Thanks so much for sharing your experience! It’s great to hear you’re pleased with our service, environment, and quotes. We’re here whenever you need us! - Greg Kostuk Insurance Agency"
marina Luna
September 11, 2025
"I am currently looking into switching over to State Farm for auto insurance and Caleb was so helpful this morning walking me through all the steps that come along with switching over. he walked me through the whole process and made sure I was well informed on all my options as well as educate me on insurance in general. As a young adult navigating the important things such as insurance i felt very grateful to have someone as caring as Caleb on the phone with me , he was kind informative and made sure I understood every detail we went over."
"Thank you for the kind review! We're glad Caleb was able to walk through your options and answer all of your questions. - Greg Kostuk Insurance Agency"
Erika
September 10, 2025
"Sure! Here's a draft for your review: --- I recently had the pleasure of speaking with Mike Sena regarding my insurance needs, and I couldn't have been more impressed. He was incredibly informative and provided me with valuable insights, demonstrating a deep knowledge of the industry. Mike's professionalism and friendly demeanor made the conversation enjoyable. His ability to explain complex information in a clear and concise manner was refreshing. I highly recommend Mike for anyone seeking insurance advice—his expertise and customer service are truly top-notch!"
" Thank you for your positive review! We’re glad Mike could provide clear, informative guidance and make your experience enjoyable. We appreciate your recommendation! - Greg Kostuk Insurance Agency"