According to Grok:
Based on the latest available data, around 3,286 Californians moved to Montana from 2021 to 2022 according to IRS data analyzed by SmartAsset.com. However, another source from the San Francisco Chronicle reported that more than 13,000 Californians moved to Montana since the beginning of the pandemic, indicating a significant influx during that period. These numbers suggest that while the annual migration might be in the thousands, the total over recent years could be higher, especially considering the broader context of population movements during the health crisis.
Montana’s population records in at 1.13 million.
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