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Dennis O'Riley

Dennis O'Riley
Real Estate Agent (Salesperson)
Marietta GA

Salesperson (GA: 355364)

21 years experience

REALTOR® 1 Active Listings Serves Cobb County, GA
View on Realtor.com

Contact Information

Brokerage
Keller Williams Realty Atlanta - East Cobb

Office Website
Office Address
3730 Roswell Rd
Marietta, GA  30062
(Cobb County)
Office Phone
770-509-0700
Office Fax
770-509-5097
Mobile
770-335-8814
Email
denn**@*************.com
Show Email for $5

Service Areas

Milton: GA Alpharetta: GA Johns Creek: GA Fair Oaks: GA Marietta: GA Roswell: GA Sandy Springs: GA Mountain Park: GA Smyrna: GA Mableton: GA Holly Springs: GA Canton: GA Woodstock: GA Atlanta: GA

About Dennis O'Riley

With extensive experience as a REALTOR®, Dennis is committed to delivering exceptional real estate services while upholding the highest standards of ethics and integrity. His primary focus is on effectively marketing homes to potential buyers nationwide, ensuring that sellers find the right buyer at the optimal price, all while accommodating their timelines. For buyers, Dennis prioritizes identifying the perfect home in the ideal neighborhood at a competitive price, managing the entire transaction process to facilitate a seamless closing.

Having relocated eight times across different states over the past thirty years, Dennis understands the complexities and stresses involved in buying and selling homes. This personal experience drives his dedication to keeping clients informed and supported throughout their journey.

Dennis brings over 35 years of expertise in sales, customer service, and operations leadership, with a background in equipment leasing and real estate. He values networking and has cultivated enduring relationships by consistently providing top-tier professional service. His strengths include effective communication, strong business acumen, a sense of urgency, meticulous attention to detail, and practical problem-solving skills.

On a personal note, Dennis has been married to Mary K for 33 years, and they have two daughters: Kelly Megan, a middle school teacher in Louisville, Kentucky, and Leigh Erin, a registered nurse at Children’s Healthcare at Egleston in Atlanta. The family has called Atlanta home for over thirteen years, having previously lived in cities such as Austin, Tampa, Seattle, Birmingham, Lafayette, and Nashville.

Dennis views referrals from friends, family, and business associates as the highest compliment and the foundation of his success. He understands the importance of earning trust and confidence and is dedicated to being a focused and energetic advocate for his clients. For a no-obligation assessment of your real estate needs, Dennis welcomes you to reach out at 770-335-8814 or via email at Dennis@TheORileyTeam.com. He would be honored to assist you or someone you know in their real estate journey.

Cobb County, GA Real Estate Market Analysis (Single Family Homes)

$620,385
Avg. Listing Price
From Dennis's portfolio
4.0 / 3.3
Avg. Beds/Baths
Typical property size
2,895 sf
Avg. Square Footage
Interior living space
2743
Active Listings
Current inventory

The Cobb County real estate market stands as one of Georgia's most dynamic and diverse property landscapes, attracting homebuyers and investors with its unique blend of suburban charm and metropolitan convenience. Located just northwest of Atlanta, this thriving county has experienced remarkable growth over the past decade, transforming from a primarily residential area into a major economic hub that rivals many standalone metropolitan areas across the Southeast.

What makes Cobb County particularly fascinating is its ability to maintain distinct neighborhood identities while supporting a robust network of 11,342 total actively licensed agents—all of whom maintain active email communications. This substantial professional presence reflects the area's consistent transaction volume and the complexity of serving such a geographically and economically diverse market.

Major Cobb County, Georgia Real Estate Markets

Marietta serves as the county seat and primary market driver, offering everything from historic downtown condominiums to sprawling estate properties in prestigious neighborhoods like East Cobb. The city's proximity to major employers and its well-established infrastructure make it a consistent performer in both residential and commercial sectors. Meanwhile, Kennesaw has emerged as a surprising hotspot for young professionals and families, particularly around Kennesaw State University, where townhomes and modern subdivisions command premium prices.

Smyrna represents another crucial market segment, with its revitalized downtown area attracting significant investment in mixed-use developments and luxury apartments. The western portions of the county, including Powder Springs and Austell, offer more affordable entry points while still providing access to Atlanta's job market, creating distinct micro-markets that require specialized local expertise to navigate effectively.

Market Dynamics and Geographic Complexity

Cobb County's real estate landscape is characterized by dramatic price variations that can shift within just a few miles, largely influenced by school district boundaries, proximity to major highways like I-75 and I-285, and access to the Silver Comet Trail. The county's unique position as both a destination for Atlanta commuters and a self-contained economic center creates interesting dynamics where properties near corporate headquarters in Cumberland or the Battery Atlanta command different premiums than similar homes in more traditional suburban settings.

One surprising trend involves the increasing demand for properties near the county's expanding entertainment and sports venues, particularly around Truist Park and the surrounding development. This area has seen property values increase substantially, while simultaneously creating new opportunities for short-term rental investments and commercial real estate ventures that didn't exist just five years ago.

Why Businesses Need Cobb County, Georgia Agent Contact Data

With 11,342 agents with email addresses actively working in this market, the competition for client attention and professional partnerships is intense. Mortgage lenders, home inspectors, contractors, and other real estate service providers need direct access to these professionals to build the referral networks essential for success in such a fragmented market. The sheer number of active agents also indicates the volume of transactions requiring ancillary services.

Additionally, companies looking to relocate employees to the area or real estate technology firms seeking to penetrate this market need comprehensive contact data to effectively reach decision-makers. The diversity of property types and price points means that different agents specialize in vastly different market segments, making targeted communication strategies essential for businesses hoping to establish meaningful professional relationships in Cobb County's competitive real estate ecosystem.

Current Property Listings

As of 2/17/2026, Dennis O'Riley has 1 property for sale in Marietta and surrounding areas.

$815,000

Listed 2026-01-27

1427 Lafayette Ln
Marietta, GA  30068

Beds: 5.0
Baths: 2.5
Sq Ft: 4,406
Lot: 23,217 sf
Single Family Map
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Current Property Rentals

As of 1/15/2026, Dennis O'Riley has the following rental property available in Marietta and surrounding areas.

$2,000

Listed 2025-10-06

2814 Cobb Place Manor Ct
Marietta, GA  30066

Beds: 3.0
Baths: 2.5
Sq Ft: 1,714
Lot: 7,945 sf
Single Family Map
View Full Details