Singapore is about 248 times smaller than North Dakota.

North Dakota is approximately 178,647 sq km, while Singapore is approximately 719 sq km, making Singapore 0.4% the size of North Dakota. Meanwhile, the population of North Dakota is ~672,591 people (5.2 million more people live in Singapore).
Tip: This to-scale comparison of North Dakota vs. Singapore uses the Mercator projection, which distorts the size of regions near the poles.