Is there a white paint that stands out at night, or in the dark?

You want reflective paint, sold at paint stores, home improvement stores, hardware stores, craft stores, even Walmart, Target, etc.

there are several paint companies that offer a glow in the dark "white" paint. It looks white during the day then will glow for several hours after sunset. I believe Krylon makes one but you should check eBay or Amazon.

Yes, ask the paint store for Glow in the Dark or luminescent paint. You can also get reflective paint that stands out in a headlight or flashlight beam.

Some fire departments can help you with this task.

Many use self-adhesive numbers on a mailbox that may be a combination of luminescent and reflective. Reflective numbers are usually the preferred solution because they provide a high contrast image with just a bit of light. Luminescent paint is better where there will not be any ambient light.

I love the paint ideas! I was wondering about using the reflective tape bikers and such use. The numbers would light up by someone's headlights and might be kind of fun if you are so minded.

menards sells a spray Kryon paint that glows in the dark and you can get it in colors