Mary Alonso

Mary Alonso


Languages Spoken:

  • English
  • Spanish
  • 608-436-2231
  • 608-436-2231
  • 608-449-6795 ext Spanish
  • 608-756-4196
  • 2715 Kennedy Rd
    Janesville, WI 53545
Contact Me


Welcome to the number one place to search for properties on the web! Whether you are searching for your new home or looking for one of the most innovative listing sites available to showcase your property - you need look no further. Mary's personal knowledge of the local Real Estate market is combined with the power of the Century 21 brand. Let Mary assist you in finding your dream home, in a neighborhood that is right for you, and in the price range you want. Or if you are interested in selling a property, she also has the expertise to help you get the fastest sale.

Meet Mary!

Thank you for taking time to visit Mary's website.  Please know that any time you have questions about real estate just ask Mary at or call/text her at 608-436-2231.  Mary would be happy to help and always appreciates your business.  Mary earned her Bachelor of Science Degree from the University of Wisconsin-Stout in Hotel and Restaurant Management.  She also studied Real Estate and took her test in Chicago in 2006.  Mary passed the first time with flying colors! Mary has been a licensed Wisconsin REALTOR® since 2006.  She serves Southern Wisconsin but would be happy to help you locate a realtor in your area.  Just ask Mary

When Mary is not working on real estate projects, you can probably find her at one of the many ice arenas, soccer fields, or lacrosse fields around the state because her kids are in a lot of different sports.  In Mary's free time, she enjoys sailing, boating, kayaking, fishing, or just hanging out with her friends. 

If you are not from Janesville, don't worry, there are many things to do and see in the area.  Make sure in the summer you catch the free show put on at Traxler Park every weekend by the Aqua Jays, National Water Ski Champions.

Buying and Selling

Just ask Mary and she'll tell you!  Mary has a number of professional memberships to include: 

  • National Realtors Association
  • Wisconsin Realtors Association
  • Rock Green Realtors Association. 

Your home is possibly one of the biggest assets that you will ever have.  Whether it is time to maximize the value for that asset through the sale of your home, or whether you are making a new purchase just ask Mary.  Now is a great time to buy or sell a home!

If you are a buyer, Mary can help you choose the right home or property for your needs, and she will guide you toward making an informed real estate decision. Mary prides herself in being able to give all her clients important local information based on years of enjoying living in Southern Wisconsin.

If you are a seller, Mary can help price and put your home or property on the market for a quick sale.  If you would like to find out the value of your home, Mary will research the value and provide you with a complimentary comprehensive report. All you have to do is ask.

Ask Mary, she can do just about anything.  If she can't help you, Mary will help you find the right person for the job.  Mary is grateful for referrals and she'd have to say that her specialty is to match people relocating in or out of the area with the perfect home or REALTOR®.  Mary's sucess in real estate is dependent on referrals from friends like you.  Do you know of someone considering buying or selling?  If so, please let that person know of Mary's services.  Ask Mary, she's just a click or phone call away at or call/text Mary at 608-436-2231...

Ask for Mary Alonso!

En Espanol maque el numero 608-449-6795.

Did You Know?

Did you know that unless you have a buyer's agency contract with your REALTOR®, they are obligated to be working for the seller?  It is very important to know this when negotiating on your new home or investment. Only if you have a Buyer's Agency Contract with your REALTOR® are they working in your best interest.  Just ask Mary, she'd love to sign you up.

  • Did you know that Mary can show you any home listed on the MLS in Wisconsin?  It does NOT have to be listed by CENTURY 21 Affiliated - it can be listed by any company.
  • Did you know that all of our listings have their own youtube video?  Pretty Cool!
  • Did you know that you can purchase a Home Warranty for your home?  Just ask Mary, she would love to send you free information about it.
  • Did you know that with the large number of other agencies in Rock County the Janesville office sells 40% of the listings?  Nobody else comes close.
  • Did you know that there is a new FHA initiative to allow boomerang buyers (people who had lost their homes to foreclosure, bankruptcy, etc.) purchase and finance a home more quickly?  More information on this program can be found at
  • Did you know Mary would love it if you would share her website and any useful information with your friends and family?  It is 100% true!

Giving Back: Easter Seals and United Way

Janesville, Wisconsin's Park Place offers a great place to work, live, and play. Located in south central Wisconsin, Janesville has over 2,300 acres of parkland, 20 acres of botanical gardens, 25+ miles of paved bike trail, boat launches along the Rock River, 2 public golf courses, ball fields, tennis courts, and more.

Founded in 1836, Janesville also boasts 9 historic districts and 20 percent of Wisconsin's buildings that are listed on the National Register are found in Janesville. Janesville residents have bene committed to excellence in commerce, education, recreation, and culture.

Are you considering moving to the Janesville, Wisconsin or a surrounding community? If so, your search for a REALTOR® is over. Our office has a team of over 40 professional REALTORS® able to assist you in the purchase of a new home or the sale of your current property. Janesville agents live and work in Rock County and can provide you with a level of service and knowledge of the market that is unsurpassed.

According to the South Central Wisconsin Multiple Listing Service, CENTURY 21 Affiliated - Janesville is the #1 Real Estate office in homes sold in Janesville and Rock County. In 2012 and 2013, the office was recognized as a Double Centurion Award Winning office by CENTURY 21.

CENTURY 21 Affiliated believes in giving back. Our office supports Easter Seals of Wisconsin, United Way Blackhawk Region, ECHO, and Salvation Army.

Easter Seals has been helping individuals with disabilities and special needs, and their families, live better lives for nearly 90 years. From child development centers to physical rehabilitation and job training for people with disabilities, Easter Seals offers a variety of services to help people with disabilities address life’s challenges and achieve personal goals.

CENTURY 21 Affiliated has events every year to raise money and awareness.  Mary also had the pleasure once again to help the United Way by helping to raise money at an auction we have every year.  Our Broker, Randy Borman promised us he would shave his head if we reached our goal.  Sure enough we did and boy did Randy look different.



Contact Me

Looking to buy a home? Connect with Mary through the ZAP app!

With the state-of-the-art technology with CENTURY 21, finding a home has never been easier!  Visit Mary's ZAP website (or click on the image above) and download the mobile app to start your home search today!

Free Money

Free Money!  Does Mary have your attention now?  If you are a first time home buyer a lot of cities have first time home buying classes you can take.  Upon completion they may give you a grant toward your down payment.  In Janesville, you can get up to $2,500 toward down payment assistance.  Just ask Mary and she'd be happy to help you find some free money.

Enthusiasm is priceless-and also free...Mary promises to give you as much of this as you should be a headache free process.

Why choose us? Because we are #1 at what we do! This isn't just a sales pitch, check out this youtube video below


  • Realtor