Background: Mild traumatic brain injuries (mTBIs) are a significant public health concern in the US. Understanding incidence and demographic patterns is essential for developing targeted prevention and intervention strategies. The most recent study using national healthcare records to examine incidence utilized data from 2016, highlighting the need for updated estimates that reflect current trends. Methods: The MarketScan^® Database was used for this study which includes person-specific clinical utilization, expenditures, and enrollment across different services. A query for mTBIs (S06.0x.xx) or post-concussion syndrome (F07.89) from January–December 2023 was performed for patients aged 0–64. Patients with the same diagnosis codes for the prior 12 months (i.e., chronic diagnosis), moderate to severe TBIs (S06.2–9), skull fractures (S02.xx), and/or brain hemorrhages (S06.3x) were excluded. Results: Out of 11,737,855 insured members with data in 2023, 43,213 new mTBIs were recorded (incidence rate = 0.37%), with the highest rate in adolescents (incidence rate = 1.27%). From the ages of 0–14 years, males had a higher incidence of concussion, but from 15 to 65 years, females had a higher incidence. Minimal differences were seen between urban and rural zip codes. Conclusions: Concussion incidence in adolescents is higher than other age groups, which may reflect increased participation in sports or heightened vulnerability during development. Males had a higher incidence than females during childhood, but females did later in life. These differences may reflect true disparities in injury risk, variations in reporting patterns, or a combination of both. Further research is warranted to understand the underlying mechanisms and to inform age- and sex-specific prevention efforts.