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John L Costello

John L Costello
Real Estate Agent (Broker Sales)
Miami FL

Broker Sales (FL: 3285902)

13 years experience

REALTOR® 1 Active Listings Serves Miami-Dade County, FL
View on Realtor.com

Contact Information

Brokerage
Keller Williams Realty Premier

Office Website
Office Address
11420 N Kendall Dr Ste 207
Miami, FL  33176
(Miami-Dade County)
Office Phone
305-595-2844
Office Fax
786-433-2955
Mobile
305-714-2122
Email
j***@************.com
Show Email for $5

Service Areas

Miami: FL Coral Gables: FL Glenvar Heights: FL Kendall: FL South Miami: FL Olympia Heights: FL Sunset: FL Kendale Lakes: FL Richmond Heights: FL The Hammocks: FL The Crossings: FL Country Walk: FL Three Lakes: FL Palmetto Bay: FL Pinecrest: FL Gables By The Sea: FL Village of Palmetto Bay: FL Richmond West: FL Goulds: FL Quail Heights: FL South Miami Heights: FL Perrine: FL Palmetto Estates: FL Cutler Bay: FL West Perrine: FL Cutler Ridge: FL Homestead Base: FL Naranja: FL Leisure City: FL Princeton: FL Homestead: FL Key Biscayne: FL

About John Costello

With its stunning beaches, vibrant lifestyle, and diverse business opportunities, Miami has become a sought-after destination for both residents and investors. John Costello brings over 20 years of expertise in management, rentals, and sales to the Southern Florida real estate market, making him a trusted advisor for those looking to realize their real estate aspirations.

Whether clients are searching for their ideal home, exploring investment properties, or considering renovation projects, John and his team possess the knowledge, resources, and negotiation skills necessary to navigate the complexities of the market. Their meticulous attention to detail ensures that each client's needs are prioritized, with a commitment to fulfilling every requirement on their wish list.

When you are ready to embark on your next real estate journey, trust The Costello Group at Keller Williams Realty to serve as your dedicated fiduciary in Miami, FL.

Miami-Dade County, FL Real Estate Market Analysis (Single Family Homes)

$1,954,965
Avg. Listing Price
From John's portfolio
3.8 / 3.0
Avg. Beds/Baths
Typical property size
2,306 sf
Avg. Square Footage
Interior living space
10004
Active Listings
Current inventory

Mortgage lenders, title companies, PropTech startups, real estate recruiters, insurance agents, and continuing education providers all need one thing: direct access to Miami-Dade County's 86,095 actively licensed real estate agents. Whether you're launching loan products, recruiting top performers, or promoting compliance training, having verified email addresses for every agent in this massive market gives you the competitive edge you need.

Generic statewide campaigns get lost in the noise, but targeted outreach to Miami-Dade agents delivers measurable results. Our comprehensive database includes both sales agents and brokers with current licensing status, updated monthly from official state records. Unlike outdated lead lists that waste your marketing budget on bounced emails and inactive contacts, this verified data connects you directly with decision-makers who are actively working deals in South Florida's hottest real estate market.

Why Buy a Miami-Dade County Real Estate Agent Email List From Dr Bill

Our Miami-Dade agent data comes directly from Florida's Department of Business and Professional Regulation licensing board, ensuring you get accurate, current information on every actively licensed professional. We update the entire database monthly and guarantee 96% email deliverability, which means your campaigns reach real inboxes instead of bouncing back. Cheap alternatives from discount vendors typically deliver 60-70% accuracy rates, wasting your time and damaging your sender reputation.

What sets our data apart is granular geographic targeting that no other vendor provides. While competitors only offer county-wide dumps, we segment Miami-Dade agents down to individual zip codes, letting you target specific neighborhoods, luxury markets, or emerging areas where your services matter most. This precision targeting dramatically improves response rates compared to broad-brush approaches that treat all agents the same.

How to Use This Miami-Dade County Agent List

Email outreach remains the most cost-effective way to reach thousands of agents quickly, but mainstream platforms like Mailchimp and Constant Contact prohibit purchased lists. Instead, use cold-email platforms designed for B2B outreach, or leverage Zap Contact at zapcontact.com—Dr Bill's purpose-built platform optimized specifically for purchased real estate agent lists. You can also use this data for direct mail campaigns, phone prospecting, or LinkedIn connection requests by matching email addresses to social profiles.

Smart marketers segment by license type, separating high-volume brokers from individual sales agents to customize their messaging. Brokers typically need different services than newer agents, so tailored campaigns based on license level generate higher conversion rates. The data also works perfectly for recruiting campaigns, letting you identify top performers at specific brokerages or target agents in particular price ranges or property types.

Why Miami-Dade County, Florida Agent Data Matters

Miami-Dade County encompasses major markets including Miami, Miami Beach, Coral Gables, Homestead, and Aventura, each with distinct client needs and property characteristics. With 86,095 licensed agents working across these diverse markets, targeted local outreach significantly outperforms generic statewide campaigns that get ignored. Agents want solutions relevant to their specific territory, whether they're selling luxury condos in Brickell or family homes in Kendall.

When you buy Miami-Dade County real estate agent email list data, you're investing in precision marketing that speaks directly to local market conditions and agent challenges. County-level targeting lets you reference specific neighborhoods, local lending requirements, or regional compliance issues that resonate with agents working those areas daily. This local relevance drives engagement rates that broad campaigns simply cannot match.

Current Property Listings

As of 3/27/2026, John Costello has 1 property for sale in Miami and surrounding areas.

$10,900,000

Listed 2025-12-19

6750 Granada Blvd
Coral Gables, FL  33146

Beds: 5.0
Baths: 4.0
Sq Ft: 5,704
Lot: 20,886 sf
Single Family Map
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Current Property Rentals

As of 1/31/2026, John Costello has the following rental property available in Miami and surrounding areas.

$3,500

Listed 2025-11-03

11031 SW 43rd St
Miami, FL  33165

Beds: 3.0
Baths: 2.0
Sq Ft: 1,698
Lot: 7,405 sf
Single Family Map
View Full Details