Homes in Grassy Key (58.9), Marathon, FL

5 for sale · 7 homes listed · Updated November 9, 2026

• 59720 Overseas Highway 7, Marathon 33050 $2,975,000 · 5 bd · 5 ba · 3,013 sqft
• 59720 Overseas Highway Unit 8, Marathon 33050 $3,500,000 · 4 bd · 5 ba · 3,013 sqft
• 58773 Overseas Highway, Marathon 33050 $1,675,000 · 3 bd · 2 ba · 1,280 sqft
• 59720 Overseas Highway 9, Marathon 33050 $3,100,000 · 5 bd · 5 ba · 3,013 sqft
• 59720 Overseas Highway 10, Marathon 33050 $3,400,000 · 5 bd · 5 ba · 3,013 sqft
• 57477 Morton Street, Marathon 33050 Active Under Contract $1,600,000 · 2 bd · 2 ba · 1,152 sqft
• 58950 Overseas Highway 13, Marathon 33050 Off market since Jul 2026 $1,090,000 · 3 bd · 2 ba · 1,404 sqft