GAZA CITY — Telltale signs of the displaced are everywhere in Gaza.

Tiny sandals are scattered on the doormat of a lawyer’s office above downtown Gaza City’s main street: The tiny feet belong to the children who have been living inside since July 20. Upstairs, in the dental laboratory where Mohamed Efranji fashions crowns and veneers, there are trays of onions, potatoes, red peppers and tomatoes to feed three families who now call it home.

At the Rimal Salon at the edge of the Beach refugee camp, two hairdressers have brought their 10 younger siblings to stay. On Tuesday, their mother was making macaroni on a camp stove in a mirrored back room where brides usually primp. Around the corner, a colorful blanket blocked a doorway to a long-closed Internet cafe where 13 more people have set up house in two high-ceiling rooms that lack both running water and working electric outlets.

Scores of families have hung sheets and scarves from every available tree and pole to create shady spaces on the grounds of Al Shifa Hospital; in the unauthorized camp, a 3-month-old slept one recent morning in a wire crib lined with cardboard.

On Sunday, more than 235,000 people were still crammed into 81 of the United Nations’ 156 schools, where classes are supposed to start next Sunday. “The chances of that,” acknowledged Scott Anderson, deputy director of the agency that runs them, “are zero.”