Milam County Texas map

It lies on the inner edge of the Blackland Prairie where the black soil gives way to the sandy post oak country. Falls County is north, Robertson northeast, Burleson southeast, Lee south, Williamson southwest and Bell northwest. Temple is 30 miles northwest, Bryan 37 miles east, College Station 40 miles southeast and Georgetown 43 miles southwest in a straight line. No interstate crosses the county; I-35 is about 25 miles west and I-45 roughly 60 miles east.

Milam is one of the original counties, set up as a municipality under Mexican rule and organised as a county in 1837. It was enormous at the start — the Milam District reached far up into what is now North and Central Texas — and more than two dozen present-day counties were eventually cut out of it. It is named for Benjamin Rush Milam, the colonizer killed leading the assault on San Antonio in December 1835.

Rockdale and Cameron are within twenty people of each other, an unusually even split between a county seat and its rival. Cameron holds the courthouse and the county offices; Rockdale had the industry, and its population rose and fell with the smelter. Thorndale sits on the Williamson County line in the southwest, Milano on US-79 between Rockdale and the Burleson County line, and Buckholts up in the northwest on US-190.

The Little River enters from Bell County in the northwest, runs east past Cameron and joins the Brazos at the corner where Milam, Robertson and Burleson counties meet. The San Gabriel River comes up out of Williamson County through the southwestern corner and empties into the Little River inside Milam County, which is where the two drainages that water most of Central Texas finally combine. The bottoms along both are wide, wooded and prone to flooding; the pecan groves and row-crop fields there are some of the most productive land in the county, while the uplands between them run to pasture and hay.

The San Gabriel crossing in the southwest is one of the oldest routes in the state. The Spanish founded the three San Xavier missions on the San Gabriel in what is now the southwestern part of the county in 1746, an attempt that lasted less than a decade before drought and disease closed it down.

Shallow lignite coal underlies the south of the county, and it was mined here from the 1890s. The scale changed in 1952, when the Aluminum Company of America opened a smelter at Sandow between Rockdale and Thorndale, with a captive lignite mine and its own power plant next door — the coal went straight from the pit to the boilers and the electricity went straight to the potlines. The plant ran for more than half a century and made Rockdale a manufacturing town in a county that otherwise farmed.

Alcoa idled the potlines in 2008 and closed the smelter for good, and the Sandow power plant shut down in 2018; the mined land has been reclaimed into pasture and lakes under the state's surface-mining rules. The site's high-voltage transmission connections outlived the smelter, and since the late 2010s the old Alcoa property has been redeveloped for large data-centre and cryptocurrency-mining operations that draw the same kind of load the potlines once did. The brick storefronts along Rockdale's main street date from the earlier coal and railroad years, before the smelter arrived.