
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.
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What our customers say about us...
kristie Hays
October 6, 2025
"Justin was fantastic to work with! Very easy to get quotes from and very knowledgeable!"
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!"
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!"
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."
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!"
Aaron Hills
September 25, 2025
"Great customer service and great insurance at a affordable price."
Elisa Lopez
September 24, 2025
"Justin and Landon were awesome!!! Exceptional customer service!!! They both were so efficient, helpful and listened to my needs."
Colton McGrew
September 24, 2025
"Caleb did a great job. He patiently explained all the different coverages"
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!"
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."
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."
Catie Kean
September 18, 2025
"Justin was great! He made getting insurance fast and easy."
Raymond Cenname
September 17, 2025
"Excellent customer serves through out the whole process"
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."
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"
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."
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!"
Jaden Itschert
September 9, 2025
"I’m only a 25 year old guy. Had no idea what all is entailed with Life Insurance. Mike was the man who helped me out. Everyone was out of the office so it was just him and I having a great conversation. I left with no questions, just thanks for his time and the amount of support he gave me, he was humorous, kind and very understanding of all I had to ask. I appreciate Mike and I definitely recommend giving him a call! Have a great day!!"
Si Frye
September 7, 2025
"Mike sena is very nice! He made sure all of my information was perfect, and that I was getting exactly what I wanted."
Cally Pissare
September 6, 2025
"Zack Webb and the State Farm office workers were a welcome change to the five other insurance companies that we visited. I was greeted at the door, offered something to drink and promptly given service. We were buying a new home and needed home and auto coverage. Zack was professional and knowledgeable and offered us the best options and we didn’t have to wait for answers or for our quote. State Farm offered by far the best wind, hail, and water coverage of any company that we spoke to. I would highly recommend Zack and State Farm."
Kayla Englert
September 6, 2025
"Justin & Jacob were great. Not only were they incredibly personable but they were very thorough in their information, explaining additionally any questions I had about coverage or my home location. I was very happy to go back to State Farm. Thanks for all the help guys!"
Patrick Simpson
September 5, 2025
"This specific office is extremely professional, knowledgeable, and ethical. After being helped by Mike Sena, I felt genuinely cared for and very well informed on how to make a custom auto policy that would provide me the best coverage and save me the most money. Mike is great at demystifying insurance in an accurate and concise manner. I also was able to save a ton relative to my previous policy. If you need someone to who is knowledgeable, polite and interested in tailoring an auto policy directly to you, call the Kostuk State Farm office and ask to work with Mike."
Melissa Quintana
September 5, 2025
"Working with Levi today made things easy and effortless the way he took his time to make sure i was safe with what i needed thank you Levi"
Bethany Siekmeier
September 5, 2025
"I had a tricky insurance requirement for work. Greg Kostuk's office helped me solve the issue in a quick and easy manner. Thank you, Maddie!"