The Bronze Age was probably a period of relative prosperity in Halland. This is shown in the number of new settlements and the numerous archaeological remains. Over 1,100 tumuli and grave mounds are found.
The end of the Bronze Age witnesses an over-consumption of the resources. Large areas were deforested. This might have been a result of a high demand for charcoal in smelting gold or bronze among the local elites.
The worsening climate at the beginning of the Iron Age meant that the local elites no longer could obtain bronze to the same extent as before. As a result the social structures collapsed.
The early Iron Age social structures seems to have been relatively egalitarian, but from around 200 AD there is a trend where villages form larger communities and small kingdoms. This is likely to have been a distant influence from the growing Roman empire. During the 5th and 6th century large free-standing farms were created; they grew larger as time passed. An example of such a farm can be found in Slöinge.
It was not just the social structure that changed, so too did the settlement structure. New villages were formed, while old were abandoned. The new centers that were formed became the kernel from which new areas were settled during medieval times.
According to information from a trader travelling from Skiringssal, close to the Oslofjord to Hedeby in the 870s it can be concluded that Halland was a Danish area at that time. It would stay so for the larger part of recorded historical times.
As part of the Scanian lands (then part of the Kingdom of Denmark, Halland came under the Scanian Law and participated in the Scanian Thing, one of three Things electing the Danish king. Local assemblies took place in Getinge.
Halland was the scene of considerable military action from the 13th century and on as Sweden, Denmark and to some degree Norway fought for supremacy in Scandinavia. The many wars made the province poor. Not only were material damages caused by military action, but the social impact of the fighting was devastating; people lacked the motivation to invest in their land and properties as it was likely to be destroyed anyway.
The county was the site of combat and plunder three times during the 13th Century: in 1256 Haakon IV of Norway invaded, followed by Magnus I of Sweden in 1277 and Eric VI of Denmark in 1294. The county came to be split in two parts for the next century, with the river Ätran forming a boundary. The lords of the two parts succeeded each other in a high tempo.
During the rebellion of Engelbrekt in 1434 the fortress in Falkenberg was burnt down and two years later was captured by the Swedes. The Sweco-Danish struggles in the early 16th century came to affect the province as well, as in 1519 when the border regions were sacked by the Swedes as a vengeance for similar Danish action in Västergötland.
The Danish civil war called the Count's Feud in 1534–36, the Northern Seven Years' War between Denmark and Sweden in 1563–1570 and the Kalmar War between Denmark and Sweden in 1611–1613 all affected Halland. One of the major battles of the Northern Seven Years' War, the battle of Axtorna, took place in Halland.
Halland was temporally (for a period of 30 years) transferred to Sweden in 1645 under the terms of the Second Treaty of Brömsebro. The conquest was later made permanent by ceding of the province in the Treaty of Roskilde in 1658. The last battle in Halland took place in Fyllebro on 17 August 1676, during the Scanian War.
The more peaceful conditions that followed meant that the province could start to develop again. The 19th century saw the farming develop quickly to become one of the more efficient in the country by the end of the century. Parts of the province did however remain poor and erosion and blown sand remained a problem for much of the century. The county did therefor see a lot of emigration, continuing well into the 20th century.
The 20th century has seen the province becoming one of the fastest growing in Sweden, as it has doubled its population since World War II. This is in part due to the northern parts, such as Kungsbacka and Onsala, more or less becoming suburbs of Gothenburg.
Privileges to towns in Halland was during the Danish time granted to:
Such privileges have no official significance nowadays.
Hundreds of Sweden were provincial divisions until the early 20th century, when they lost importance. Halland's hundreds were: Faurås Hundred, Fjäre Hundred, Halmstad Hundred, Himle Hundred, Höks Hundred, Tönnersjö Hundred, Viske Hundred and Årstad Hundred.