Issue The connectivity of local streets shapes travel choices for residents and the long-term resilience of cities. In neighborhoods with connected streets — characterized by a grid or similar pattern with direct walking routes and few dead ends — residents walk more and own fewer cars. Where streets are disconnected — for example, in hillside canyons or gated communities — the private car is typically the only option. And once laid down, street patterns rarely change, even after wartime bombing, fires, earthquakes, and other disasters. We quantified the connectivity of streets worldwide using a composite indicator — the Street-Network Disconnected index (SNDi) — that quantifies and captures the circuity of walking routes, the fraction of dead ends, and other network characteristics of street connectivity. Higher values of SNDi mean less connected (more disconnected) streets such as those in a gated community or cul-de-sac neighborhood, while lower values are found in grid-like and similar patterns. Here, we focus on some of the trends and the implications for urban resilience, especially for wildfire risk in California. Key Research Findings Neighborhoods with the highest wildfire risk have the least connected streets. Previous research shows that connected streets help residents [...]