About Mark D Olejniczak Realty, Inc.
Mark D Olejniczak Realty, Inc. is a full-service real estate company serving the Northeast Wisconsin areas of Green Bay, Appleton, Oshkosh, and Fond du Lac.
Established in 1980, Our extensive experience, proven track record, and dedication to our customers help define us as one of the premier real estate agencies in the area.

A Green Bay Tradition
Mark D Olejniczak Realty, Inc. has been a Green Bay tradition since 1980. Mark D Olejniczak Realty, Inc. is a 4th generation real estate company dating back to 1906 and is one of the longest-standing independent brokerages in Northeast Wisconsin.
The Mark D Olejniczak Realty Inc Advantage
Nearly 38% of our realty staff has earned the Certified Residential Specialist (CRS) designation from the Residential Real Estate Council, compared to only 3% of Realtors nationwide. Our Realtors have over 22 average years of experience per sales associate. When it comes to buying and selling real estate, we offer expert-level service.
#1 Real Estate Agency in Green Bay WI – Best of the Bay 12-Time Winner!
Mark D. Olejniczak Realty, Inc. is a 12-time winner of the Green Bay Press-Gazette Reader’s Choice Award for Best Real Estate Agency in Green Bay WI.
Our office is located in Allouez, one of the many historic and beautiful neighborhoods in Green Bay. We are proud to have been the recipients of the Allouez Business Association Allouez Excellence in Business Award in 2011 in the large business category. This award is extra special because it can only be won every 10 years! Thank you Allouez Business Association!
Five Consecutive Successful Years in Realty
The staff at Mark D. Olejniczak Realty, Inc. are happy to celebrate five consecutive years of success with an average total sales of $157 million and an average sales per agent of $4.4 million including all residential, multi-family, investment, and vacant land properties sold.
Dennis was amazing!
Jessie
The only Realtor I would recommend.
Lindsay K.
Our home sale with Todd was a wonderful experience and would highly recommend Todd for your real estate agent!
Amazing people
Throughout our home buying journey, Todd was truthful, responsive, and knowledgeable.
Working with Dave was wonderful.
Holly
Andrea did a great job being resourceful and finding us a home in a market where nothing was available.
Through her connections, she found a home before it hit the market. We were looking to move quickly and she got us in our house by the date we wanted to relocate. The neighborhood she recommended was a perfect fit for our family. She is a hard worker, has great contacts, and always returns phone calls and emails in a timely manner! She is always prompt and very conscientious! She is very passionate about her job!
Dave is hardworking and treats us as if we are family.
Jenny Deuster Woldt
Julie is very knowledgeable and honest.
Samuel Johnson
We definitely recommend Jordan to anyone looking to buy or sell a home!
Hope
A home purchase or sale can be a stressful situation, but Julie is always one step ahead.
Deb Meyer
Randy did an absolutely fantastic job selling our house!
Brian Boeckman
You will not find a sharper realtor than Barb!
Jack Koehne
Laura is very responsive and exceeded our expectations
Sarah Schwarten
Dennis took care of everything!
Bunny
Cha is a great realtor!
Mrs. Lauj
Sara knows her real estate and she’s just a very nice person.
Pat
Todd has helped us with the sales of three homes and the purchase of a third.
Cha is honest and will bend over backward to find the house of your dreams!
Mai Thao Baldridge
I certainly would retain Dave again with any future real estate transaction!
Linda J. Knutson
It was a pleasure working with Andrea!
I highly recommend Randy.
Ed Angelbeck
Dave was proactive in getting our places sold and we felt like we were a priority.
Tony
Power and Influence in Experience
Power and Influence in Experience
Mark Olejniczak has a wealth of knowledge in the real estate industry. His name carries respect, power and influence among his colleagues. I truly believe that the sale of our home became dependent upon those traits. Besides all of his professional capabilities, he’s a great guy. Very relatable and easy to talk to. Very happy with our outcome!
I highly recommend James Koehler.
Tyler Romenesko
Andrea was wonderful to work with!
Patrick was very helpful while we were buying our cottage.
The Vande Voorts
Julie is first class!
Allison D
Working with Pam was wonderful.
Wendy
Mark has been great!
Mike Kelly
The first house sold within one month and the second sold in less than one week!
Stephanie Callahan
Samantha was available, responsive, and got our home sold in 4 days!
I highly endorse Sara for impeccable service.
Dennis did an excellent job for our business
Our agent was Samantha Carter. Very pleasant to work with and answered questions in a timely manner.
Barb gets the job done!
Laurel Chang Kime
Mr. Koehler made the buying process pain free and his expansive knowledge and professionalism were beyond what we asked for.
Trevor Michael
Julie did an excellent job of selling our house in less than a week!!!
Jennifer
Thank you Todd for finding us our family’s first home!
Jordan is hands down the BEST!
Mike C.
We would highly recommend him!
Awowale
Dennis is an expert in real estate in the Green Bay area!
Andrea Pasqualucci
Pam was always available to answer questions and went beyond my expectations!
Bonnie
Todd was awesome to work with and I would highly recommend him to anyone looking to buy or sell their house
Our process was completely smooth from the beginning to the end and Pam was always there to answer all of our questions at any time.
Next Chapter
Jane is an exceptional advantage for a buyer.
DJ
Jimmy goes the extra mile for his clients!
Megan Diedrick
A Realtor© is available at our office 5 days a week, 8 am – 5 pm and on-call during nights and weekends to answer any question you may have about buying or selling real estate in Northeast Wisconsin.
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Mark D. Olejniczak Realty, Inc.
375 W. St. Joseph St.
Green Bay, WI 54301
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