Monday, which marks Independence Day in the United States, is a federal holiday. But what does that mean for you? Well, it depends on what you're doing.

Post offices and UPS will be closed Monday and won't be delivering mail. Fed Ex will be closed for delivery Sunday and Monday.

Most schools, if they're in session, aren't operating Monday. Many libraries, such as the ones in New York City, will close their doors Monday for the holiday, too. Most hospitals will stay open, because they don't close, but they may be running with a smaller staff. Garbage pickup varies by location.

The New York Stock Exchange will be closed, as will all Federal Reserve banks and branches. Social security offices are closed, and most department of motor vehicles offices will shut down, as well. Most bank offices, like those affiliated with Chase and Bank of America, won't be open Monday, but you can access your accounts online.

Public transportation will get messy. In New York City, the subway will run on a Saturday schedule all day Monday, which includes no 5 train service in Brooklyn and no B train at all. But there will be more 4, 7, A, C, F and S trains than normal right before and right after the fireworks show Monday night, according to the Metropolitan Transportation Authority.

In Washington, D.C., the Metrorail will run on a Saturday schedule for most of the day, then at 2 p.m. EDT Monday it will "gradually ramp up to near rush-hour service levels before and after the fireworks," according to the Washington Metropolitan Area Transit Authority. No bikes will be allowed for space reasons.

Scores of stores are running sales this weekend, so they'll be open. These include Walmart, Target, Home Depot and Best Buy, according to