The cost of a hotel room in the capital of my country, which is Washington D.C., can vary depending on the location, quality, and time of year. On average, a standard hotel room in the city can cost anywhere from $150 to $300 per night. However, luxury hotels or rooms with premium amenities can cost significantly more, ranging from $300 to over $1000 per night. It is always a good idea to research prices and book in advance to secure the best deal for a hotel room in the capital.