Sissach, the main town of the Bezirk Sissach in the canton of Basel-Landschaft, is situated in the Ergolztal at an altitude of 378 meters above sea level. The municipality spans a total surface area of 890 hectares, making it the 16th largest in the canton. Table 2 summarizes the key features of the municipality, and figure 1 shows its location on the map.

The history of Sissach is long and rich, with the first documented mention dating back to 1226. Archaeological evidence shows the area has been inhabited since the Neolithic period, with Celtic settlements around 600 to 100 BC and a Roman estate identified at Bützenen. Today, the municipality is a mix of residential, agricultural, and forested land. A summary of its history can be found on its Wikipedia page.

As of 2025, Sissach has a population of 6,991, ranking it as the 14th most populous municipality in the canton. The population consists of 80.6% Swiss citizens and 18.7% foreign nationals. The age distribution shows 16.9% are young people aged 0-17, 61.5% are of working age between 18 and 65, and 21.6% are older adults over 65. The gender ratio is nearly balanced, with 50.6% women and 49.4% men. Table 2 shows the population by age groups since 2005.

The land use in Sissach reflects its diverse landscape. Of its 890-hectare total surface, 25.5% is settlement area, 27.3% is agricultural land, and 46.6% is forest, with the remaining 0.6% classified as unproductive surface.

In terms of municipal finances, Sissach ranks 14th in the canton for total tax revenue. The municipal tax multiplier and its specific rank among the 86 municipalities are not provided in the available data.

The energy consumption profile for Sissach in 2022 shows a reliance on several carriers. Heating oil was the largest source at 43,484 MWh, followed by electricity at 38,016 MWh. Other significant sources included wood (14,477 MWh), ambient heat (9,256 MWh), and photovoltaics (4,819 MWh). Electricity is a good energy carrier for comparison, as it is used in all communities. Sissach's electricity consumption per capita is 5.5 MWh, ranking it 12th highest in the canton, placing it just outside the top 10. This relatively high per capita consumption can often be influenced by the presence of industrial or commercial activity.

The vehicle stock in Sissach as of 2026 consists of 4,033 passenger cars and delivery vans. Of these, 3,232 run on combustion engines like petrol or diesel, while 801 are electric vehicles. This means nearly one in five vehicles, or 19.9%, is electric. This data is detailed in table 3.

In 2024, the waste recycling performance in Sissach showed varying results across categories. The municipality recycled 143 kg per capita of household refuse and bulky waste, ranking 30th in the canton. For other categories, the per capita amounts and ranks were 17 kg of glass (63rd), 68 kg of green waste (61st), 13 kg of paper and cardboard (69th), 1 kg of other metals (39th), and 1 kg of tinplate and aluminum (52nd). The municipality's rankings do not place it in the top 10 for any category, indicating an average recycling performance compared to other municipalities in Basel-Landschaft. The total recycled waste and per capita values are shown in table 4.