Mercer Island is overwhelmingly a single-family-home community, with established neighborhoods of mid-century and newer residences set among mature trees and, in places, along the Lake Washington shoreline. The island is largely built out, so new construction is limited and the housing stock leans toward larger, well-maintained family homes. A smaller stock of townhomes and condominiums, concentrated near the town center, offers alternatives for those who want island living at a smaller scale. The city's enduring appeal to families is tied closely to its schools, parks, and the convenience of its central location.

The island's residential areas are organized around a central commercial district and ringed by shoreline neighborhoods. The four elementary school attendance areas — West Mercer, Northwood, Island Park, and Lakeridge — serve as familiar neighborhood markers for residents. The Town Center, near the island's middle, hosts shops, restaurants, and services. Neighborhoods along the shore and on the island's north end, close to Luther Burbank Park, are particularly prized for water access and views. Because the island is compact, most homes are within a short drive of schools, parks, and transit.

Life on Mercer Island centers on the outdoors and the schools. Residents make regular use of the island's beaches, trails, and more than 475 acres of parks, and Luther Burbank Park draws families for its waterfront, playgrounds, and sports fields. The Town Center provides everyday shopping and dining, while the larger restaurant and cultural scenes of Seattle and Bellevue are minutes away by car or light rail. The community's quiet, leafy streets and strong civic engagement give the island a distinctly suburban, family-oriented feel.

The Mercer Island School District serves the entire city and is one of the most highly regarded districts in Washington. It operates four elementary schools, Islander Middle School, and Mercer Island High School, along with alternative programs, serving roughly 4,000 students. The district's small size, strong community support, and consistent academic performance make it a central reason families choose the island. The city also has access to private school options in the broader Seattle-Bellevue area.

Interstate 90 is the island's spine, carrying traffic across Lake Washington between Seattle and the Eastside, with a carpool lane program that has long favored island drivers. Mercer Island Station on Sound Transit's 2 Line runs light-rail service between Lynnwood, downtown Seattle, and Redmond, giving riders a rail link to the region's core. Metro routes and Sound Transit express buses, including routes to Seattle, Bellevue, and Issaquah, provide additional options for commuters.

Mercer Island's recreation is anchored by its Lake Washington shoreline and its park system, which spans more than 475 acres of open space with over 50 miles of trails and three public beaches. Luther Burbank Park, on the island's northeast corner, offers waterfront access, trails, sports fields, and a popular beach. Boating, kayaking, and paddleboarding are common, and the island's trail network supports walking and running year-round. Organized sports and community programs run through the city's parks and recreation department.