As of my knowledge cutoff in September 2021, several areas in the United States have experienced significant population growth and attracted a large number of people. However, it’s important to note that migration patterns can change over time due to various factors such as economic trends, job opportunities, quality of life, and regional developments. Here are a few areas that have been popular destinations for people moving within the United States:

1. Southern and Sun Belt States: States in the southern region, including Florida, Texas, and Arizona, have seen substantial population growth. These states offer warmer climates, lower costs of living, and booming economies that attract retirees, young professionals, and families seeking new opportunities.
2. Western States: States like Colorado, Utah, and Idaho have experienced an influx of residents due to their natural beauty, outdoor recreational opportunities, and growing job markets. Cities such as Denver and Salt Lake City have become hubs for tech companies and startups, drawing talent from across the country.
3. Pacific Northwest: The Pacific Northwest, particularly the metropolitan areas of Seattle, Portland, and Vancouver, has seen a surge in population. The region’s scenic landscapes, thriving tech industry, and quality of life have made it an attractive destination for young professionals and entrepreneurs.
4. Southeastern Coastal Cities: Cities along the southeastern coast, including Atlanta, Charlotte, and Raleigh, have seen significant population growth. These cities offer a mix of job opportunities, cultural amenities, and affordable housing options, attracting individuals and families from various parts of the country.
5. Mountain States: States such as Montana, Wyoming, and Colorado, known for their picturesque landscapes, outdoor activities, and recreational opportunities, have seen an influx of residents seeking a more relaxed and nature-oriented lifestyle.

It’s important to keep in mind that population migration trends can change over time due to various factors, including economic shifts, policy changes, and cultural preferences. It’s always advisable to conduct up-to-date research and consult reliable sources when considering a move to a specific area.